mirror of
https://github.com/StackExchange/dnscontrol.git
synced 2025-02-24 15:43:08 +08:00
619 lines
18 KiB
Go
619 lines
18 KiB
Go
package cloudflare
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import (
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"encoding/json"
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"fmt"
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"log"
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"net"
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"strings"
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"time"
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"github.com/miekg/dns/dnsutil"
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"github.com/StackExchange/dnscontrol/v3/models"
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"github.com/StackExchange/dnscontrol/v3/pkg/diff"
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"github.com/StackExchange/dnscontrol/v3/pkg/printer"
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"github.com/StackExchange/dnscontrol/v3/pkg/transform"
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"github.com/StackExchange/dnscontrol/v3/providers"
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)
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/*
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Cloudflare API DNS provider:
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Info required in `creds.json`:
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- apikey
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- apiuser
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- accountid (optional)
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- accountname (optional)
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Record level metadata available:
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- cloudflare_proxy ("on", "off", or "full")
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Domain level metadata available:
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- cloudflare_proxy_default ("on", "off", or "full")
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Provider level metadata available:
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- ip_conversions
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*/
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var features = providers.DocumentationNotes{
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providers.CanUseAlias: providers.Can("CF automatically flattens CNAME records into A records dynamically"),
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providers.CanUsePTR: providers.Cannot(),
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providers.CanUseCAA: providers.Can(),
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providers.CanUseSRV: providers.Can(),
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providers.CanUseTLSA: providers.Can(),
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providers.CanUseSSHFP: providers.Can(),
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providers.CanUseDS: providers.Can(),
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providers.DocCreateDomains: providers.Can(),
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providers.DocDualHost: providers.Cannot("Cloudflare will not work well in situations where it is not the only DNS server"),
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providers.DocOfficiallySupported: providers.Can(),
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providers.CanGetZones: providers.Can(),
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}
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func init() {
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providers.RegisterDomainServiceProviderType("CLOUDFLAREAPI", newCloudflare, features)
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providers.RegisterCustomRecordType("CF_REDIRECT", "CLOUDFLAREAPI", "")
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providers.RegisterCustomRecordType("CF_TEMP_REDIRECT", "CLOUDFLAREAPI", "")
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}
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// CloudflareAPI is the handle for API calls.
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type CloudflareAPI struct {
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ApiKey string `json:"apikey"`
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ApiToken string `json:"apitoken"`
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ApiUser string `json:"apiuser"`
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AccountID string `json:"accountid"`
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AccountName string `json:"accountname"`
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domainIndex map[string]string
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nameservers map[string][]string
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ipConversions []transform.IPConversion
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ignoredLabels []string
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manageRedirects bool
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}
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func labelMatches(label string, matches []string) bool {
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printer.Debugf("DEBUG: labelMatches(%#v, %#v)\n", label, matches)
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for _, tst := range matches {
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if label == tst {
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return true
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}
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}
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return false
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}
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// GetNameservers returns the nameservers for a domain.
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func (c *CloudflareAPI) GetNameservers(domain string) ([]*models.Nameserver, error) {
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if c.domainIndex == nil {
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if err := c.fetchDomainList(); err != nil {
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return nil, err
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}
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}
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ns, ok := c.nameservers[domain]
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if !ok {
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return nil, fmt.Errorf("Nameservers for %s not found in cloudflare account", domain)
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}
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return models.ToNameservers(ns)
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}
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// ListZones returns a list of the DNS zones.
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func (c *CloudflareAPI) ListZones() ([]string, error) {
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if err := c.fetchDomainList(); err != nil {
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return nil, err
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}
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zones := make([]string, 0, len(c.domainIndex))
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for d := range c.domainIndex {
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zones = append(zones, d)
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}
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return zones, nil
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}
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// GetZoneRecords gets the records of a zone and returns them in RecordConfig format.
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func (c *CloudflareAPI) GetZoneRecords(domain string) (models.Records, error) {
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id, err := c.getDomainID(domain)
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if err != nil {
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return nil, err
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}
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records, err := c.getRecordsForDomain(id, domain)
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if err != nil {
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return nil, err
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}
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for _, rec := range records {
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if rec.TTL == 1 {
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rec.TTL = 0
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}
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}
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return records, nil
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}
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func (c *CloudflareAPI) getDomainID(name string) (string, error) {
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if c.domainIndex == nil {
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if err := c.fetchDomainList(); err != nil {
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return "", err
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}
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}
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id, ok := c.domainIndex[name]
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if !ok {
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return "", fmt.Errorf("'%s' not a zone in cloudflare account", name)
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}
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return id, nil
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}
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// GetDomainCorrections returns a list of corrections to update a domain.
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func (c *CloudflareAPI) GetDomainCorrections(dc *models.DomainConfig) ([]*models.Correction, error) {
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id, err := c.getDomainID(dc.Name)
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if err != nil {
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return nil, err
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}
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records, err := c.getRecordsForDomain(id, dc.Name)
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if err != nil {
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return nil, err
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}
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if err := c.preprocessConfig(dc); err != nil {
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return nil, err
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}
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for i := len(records) - 1; i >= 0; i-- {
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rec := records[i]
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// Delete ignore labels
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if labelMatches(dnsutil.TrimDomainName(rec.Original.(*cfRecord).Name, dc.Name), c.ignoredLabels) {
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printer.Debugf("ignored_label: %s\n", rec.Original.(*cfRecord).Name)
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records = append(records[:i], records[i+1:]...)
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}
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}
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if c.manageRedirects {
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prs, err := c.getPageRules(id, dc.Name)
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if err != nil {
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return nil, err
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}
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records = append(records, prs...)
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}
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for _, rec := range dc.Records {
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if rec.Type == "ALIAS" {
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rec.Type = "CNAME"
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}
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// As per CF-API documentation proxied records are always forced to have a TTL of 1.
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// When not forcing this property change here, dnscontrol tries each time to update
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// the TTL of a record which simply cannot be changed anyway.
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if rec.Metadata[metaProxy] != "off" {
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rec.TTL = 1
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}
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if labelMatches(rec.GetLabel(), c.ignoredLabels) {
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log.Fatalf("FATAL: dnsconfig contains label that matches ignored_labels: %#v is in %v)\n", rec.GetLabel(), c.ignoredLabels)
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}
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}
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checkNSModifications(dc)
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// Normalize
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models.PostProcessRecords(records)
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differ := diff.New(dc, getProxyMetadata)
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_, create, del, mod := differ.IncrementalDiff(records)
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corrections := []*models.Correction{}
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for _, d := range del {
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ex := d.Existing
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if ex.Type == "PAGE_RULE" {
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corrections = append(corrections, &models.Correction{
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Msg: d.String(),
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F: func() error { return c.deletePageRule(ex.Original.(*pageRule).ID, id) },
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})
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} else {
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corrections = append(corrections, c.deleteRec(ex.Original.(*cfRecord), id))
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}
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}
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for _, d := range create {
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des := d.Desired
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if des.Type == "PAGE_RULE" {
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corrections = append(corrections, &models.Correction{
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Msg: d.String(),
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F: func() error { return c.createPageRule(id, des.GetTargetField()) },
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})
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} else {
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corrections = append(corrections, c.createRec(des, id)...)
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}
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}
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for _, d := range mod {
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rec := d.Desired
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ex := d.Existing
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if rec.Type == "PAGE_RULE" {
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corrections = append(corrections, &models.Correction{
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Msg: d.String(),
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F: func() error { return c.updatePageRule(ex.Original.(*pageRule).ID, id, rec.GetTargetField()) },
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})
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} else {
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e := ex.Original.(*cfRecord)
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proxy := e.Proxiable && rec.Metadata[metaProxy] != "off"
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corrections = append(corrections, &models.Correction{
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Msg: d.String(),
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F: func() error { return c.modifyRecord(id, e.ID, proxy, rec) },
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})
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}
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}
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// Add universalSSL change to corrections when needed
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if changed, newState, err := c.checkUniversalSSL(dc, id); err == nil && changed {
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var newStateString string
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if newState {
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newStateString = "enabled"
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} else {
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newStateString = "disabled"
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}
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corrections = append(corrections, &models.Correction{
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Msg: fmt.Sprintf("Universal SSL will be %s for this domain.", newStateString),
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F: func() error { return c.changeUniversalSSL(id, newState) },
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})
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}
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return corrections, nil
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}
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func checkNSModifications(dc *models.DomainConfig) {
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newList := make([]*models.RecordConfig, 0, len(dc.Records))
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for _, rec := range dc.Records {
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if rec.Type == "NS" && rec.GetLabelFQDN() == dc.Name {
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if !strings.HasSuffix(rec.GetTargetField(), ".ns.cloudflare.com.") {
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printer.Warnf("cloudflare does not support modifying NS records on base domain. %s will not be added.\n", rec.GetTargetField())
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}
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continue
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}
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newList = append(newList, rec)
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}
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dc.Records = newList
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}
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func (c *CloudflareAPI) checkUniversalSSL(dc *models.DomainConfig, id string) (changed bool, newState bool, err error) {
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expectedStr := dc.Metadata[metaUniversalSSL]
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if expectedStr == "" {
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return false, false, fmt.Errorf("metadata not set")
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}
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if actual, err := c.getUniversalSSL(id); err == nil {
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// convert str to bool
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var expected bool
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if expectedStr == "off" {
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expected = false
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} else {
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expected = true
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}
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// did something change?
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if actual != expected {
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return true, expected, nil
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}
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return false, expected, nil
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}
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return false, false, fmt.Errorf("error receiving universal ssl state")
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}
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const (
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metaProxy = "cloudflare_proxy"
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metaProxyDefault = metaProxy + "_default"
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metaOriginalIP = "original_ip" // TODO(tlim): Unclear what this means.
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metaUniversalSSL = "cloudflare_universalssl"
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metaIPConversions = "ip_conversions" // TODO(tlim): Rename to obscure_rules.
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)
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func checkProxyVal(v string) (string, error) {
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v = strings.ToLower(v)
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if v != "on" && v != "off" && v != "full" {
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return "", fmt.Errorf("Bad metadata value for cloudflare_proxy: '%s'. Use on/off/full", v)
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}
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return v, nil
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}
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func (c *CloudflareAPI) preprocessConfig(dc *models.DomainConfig) error {
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// Determine the default proxy setting.
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var defProxy string
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var err error
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if defProxy = dc.Metadata[metaProxyDefault]; defProxy == "" {
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defProxy = "off"
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} else {
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defProxy, err = checkProxyVal(defProxy)
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if err != nil {
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return err
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}
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}
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// Check UniversalSSL setting
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if u := dc.Metadata[metaUniversalSSL]; u != "" {
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u = strings.ToLower(u)
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if u != "on" && u != "off" {
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return fmt.Errorf("bad metadata value for %s: '%s'. Use on/off", metaUniversalSSL, u)
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}
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}
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// Normalize the proxy setting for each record.
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// A and CNAMEs: Validate. If null, set to default.
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// else: Make sure it wasn't set. Set to default.
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// iterate backwards so first defined page rules have highest priority
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currentPrPrio := 1
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for i := len(dc.Records) - 1; i >= 0; i-- {
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rec := dc.Records[i]
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if rec.Metadata == nil {
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rec.Metadata = map[string]string{}
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}
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// cloudflare uses "1" to mean "auto-ttl"
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// if we get here and ttl is not specified (or is the dnscontrol default of 300),
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// use automatic mode instead.
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if rec.TTL == 0 || rec.TTL == 300 {
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rec.TTL = 1
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}
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if rec.TTL != 1 && rec.TTL < 120 {
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rec.TTL = 120
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}
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if rec.Type != "A" && rec.Type != "CNAME" && rec.Type != "AAAA" && rec.Type != "ALIAS" {
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if rec.Metadata[metaProxy] != "" {
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return fmt.Errorf("cloudflare_proxy set on %v record: %#v cloudflare_proxy=%#v", rec.Type, rec.GetLabel(), rec.Metadata[metaProxy])
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}
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// Force it to off.
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rec.Metadata[metaProxy] = "off"
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} else {
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if val := rec.Metadata[metaProxy]; val == "" {
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rec.Metadata[metaProxy] = defProxy
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} else {
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val, err := checkProxyVal(val)
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if err != nil {
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return err
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}
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rec.Metadata[metaProxy] = val
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}
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}
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// CF_REDIRECT record types. Encode target as $FROM,$TO,$PRIO,$CODE
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if rec.Type == "CF_REDIRECT" || rec.Type == "CF_TEMP_REDIRECT" {
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if !c.manageRedirects {
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return fmt.Errorf("you must add 'manage_redirects: true' metadata to cloudflare provider to use CF_REDIRECT records")
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}
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parts := strings.Split(rec.GetTargetField(), ",")
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if len(parts) != 2 {
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return fmt.Errorf("Invalid data specified for cloudflare redirect record")
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}
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code := 301
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if rec.Type == "CF_TEMP_REDIRECT" {
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code = 302
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}
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rec.SetTarget(fmt.Sprintf("%s,%d,%d", rec.GetTargetField(), currentPrPrio, code))
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currentPrPrio++
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rec.Type = "PAGE_RULE"
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}
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}
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// look for ip conversions and transform records
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for _, rec := range dc.Records {
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if rec.Type != "A" {
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continue
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}
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// only transform "full"
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if rec.Metadata[metaProxy] != "full" {
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continue
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}
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ip := net.ParseIP(rec.GetTargetField())
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if ip == nil {
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return fmt.Errorf("%s is not a valid ip address", rec.GetTargetField())
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}
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newIP, err := transform.IP(ip, c.ipConversions)
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if err != nil {
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return err
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}
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rec.Metadata[metaOriginalIP] = rec.GetTargetField()
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rec.SetTarget(newIP.String())
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}
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return nil
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}
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func newCloudflare(m map[string]string, metadata json.RawMessage) (providers.DNSServiceProvider, error) {
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api := &CloudflareAPI{}
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api.ApiUser, api.ApiKey, api.ApiToken = m["apiuser"], m["apikey"], m["apitoken"]
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// check api keys from creds json file
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if api.ApiToken == "" && (api.ApiKey == "" || api.ApiUser == "") {
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return nil, fmt.Errorf("if cloudflare apitoken is not set, apikey and apiuser must be provided")
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}
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if api.ApiToken != "" && (api.ApiKey != "" || api.ApiUser != "") {
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return nil, fmt.Errorf("if cloudflare apitoken is set, apikey and apiuser should not be provided")
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}
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// Check account data if set
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api.AccountID, api.AccountName = m["accountid"], m["accountname"]
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if (api.AccountID != "" && api.AccountName == "") || (api.AccountID == "" && api.AccountName != "") {
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return nil, fmt.Errorf("either both cloudflare accountid and accountname must be provided or neither")
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}
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err := api.fetchDomainList()
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if err != nil {
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return nil, err
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}
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|
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if len(metadata) > 0 {
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parsedMeta := &struct {
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IPConversions string `json:"ip_conversions"`
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IgnoredLabels []string `json:"ignored_labels"`
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ManageRedirects bool `json:"manage_redirects"`
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}{}
|
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err := json.Unmarshal([]byte(metadata), parsedMeta)
|
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if err != nil {
|
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return nil, err
|
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}
|
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api.manageRedirects = parsedMeta.ManageRedirects
|
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// ignored_labels:
|
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for _, l := range parsedMeta.IgnoredLabels {
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api.ignoredLabels = append(api.ignoredLabels, l)
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}
|
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if len(api.ignoredLabels) > 0 {
|
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printer.Warnf("Cloudflare 'ignored_labels' configuration is deprecated and might be removed. Please use the IGNORE domain directive to achieve the same effect.\n")
|
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}
|
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// parse provider level metadata
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if len(parsedMeta.IPConversions) > 0 {
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api.ipConversions, err = transform.DecodeTransformTable(parsedMeta.IPConversions)
|
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if err != nil {
|
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return nil, err
|
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}
|
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}
|
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}
|
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return api, nil
|
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}
|
|
|
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// Used on the "existing" records.
|
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type cfRecData struct {
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Name string `json:"name"`
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Target cfTarget `json:"target"`
|
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Service string `json:"service"` // SRV
|
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Proto string `json:"proto"` // SRV
|
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Priority uint16 `json:"priority"` // SRV
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Weight uint16 `json:"weight"` // SRV
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Port uint16 `json:"port"` // SRV
|
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Tag string `json:"tag"` // CAA
|
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Flags uint8 `json:"flags"` // CAA
|
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Value string `json:"value"` // CAA
|
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Usage uint8 `json:"usage"` // TLSA
|
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Selector uint8 `json:"selector"` // TLSA
|
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MatchingType uint8 `json:"matching_type"` // TLSA
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Certificate string `json:"certificate"` // TLSA
|
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Algorithm uint8 `json:"algorithm"` // SSHFP/DS
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HashType uint8 `json:"type"` // SSHFP
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Fingerprint string `json:"fingerprint"` // SSHFP
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KeyTag uint16 `json:"key_tag"` // DS
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DigestType uint8 `json:"digest_type"` // DS
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Digest string `json:"digest"` // DS
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}
|
|
|
|
// cfTarget is a SRV target. A null target is represented by an empty string, but
|
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// a dot is so acceptable.
|
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type cfTarget string
|
|
|
|
// UnmarshalJSON decodes a SRV target from the Cloudflare API. A null target is
|
|
// represented by a false boolean or a dot. Domain names are FQDNs without a
|
|
// trailing period (as of 2019-11-05).
|
|
func (c *cfTarget) UnmarshalJSON(data []byte) error {
|
|
var obj interface{}
|
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if err := json.Unmarshal(data, &obj); err != nil {
|
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return err
|
|
}
|
|
switch v := obj.(type) {
|
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case string:
|
|
*c = cfTarget(v)
|
|
case bool:
|
|
if v {
|
|
panic("unknown value for cfTarget bool: true")
|
|
}
|
|
*c = "" // the "." is already added by nativeToRecord
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// MarshalJSON encodes cfTarget for the Cloudflare API. Null targets are
|
|
// represented by a single period.
|
|
func (c cfTarget) MarshalJSON() ([]byte, error) {
|
|
var obj string
|
|
switch c {
|
|
case "", ".":
|
|
obj = "."
|
|
default:
|
|
obj = string(c)
|
|
}
|
|
return json.Marshal(obj)
|
|
}
|
|
|
|
// DNSControlString returns cfTarget normalized to be a FQDN. Null targets are
|
|
// represented by a single period.
|
|
func (c cfTarget) FQDN() string {
|
|
return strings.TrimRight(string(c), ".") + "."
|
|
}
|
|
|
|
type cfRecord struct {
|
|
ID string `json:"id"`
|
|
Type string `json:"type"`
|
|
Name string `json:"name"`
|
|
Content string `json:"content"`
|
|
Proxiable bool `json:"proxiable"`
|
|
Proxied bool `json:"proxied"`
|
|
TTL uint32 `json:"ttl"`
|
|
Locked bool `json:"locked"`
|
|
ZoneID string `json:"zone_id"`
|
|
ZoneName string `json:"zone_name"`
|
|
CreatedOn time.Time `json:"created_on"`
|
|
ModifiedOn time.Time `json:"modified_on"`
|
|
Data *cfRecData `json:"data"`
|
|
Priority json.Number `json:"priority"`
|
|
}
|
|
|
|
func (c *cfRecord) nativeToRecord(domain string) *models.RecordConfig {
|
|
// normalize cname,mx,ns records with dots to be consistent with our config format.
|
|
if c.Type == "CNAME" || c.Type == "MX" || c.Type == "NS" || c.Type == "SRV" {
|
|
if c.Content != "." {
|
|
c.Content = c.Content + "."
|
|
}
|
|
}
|
|
|
|
rc := &models.RecordConfig{
|
|
TTL: c.TTL,
|
|
Original: c,
|
|
}
|
|
rc.SetLabelFromFQDN(c.Name, domain)
|
|
|
|
// workaround for https://github.com/StackExchange/dnscontrol/issues/446
|
|
if c.Type == "SPF" {
|
|
c.Type = "TXT"
|
|
}
|
|
|
|
switch rType := c.Type; rType { // #rtype_variations
|
|
case "MX":
|
|
var priority uint16
|
|
if c.Priority == "" {
|
|
priority = 0
|
|
} else {
|
|
if p, err := c.Priority.Int64(); err != nil {
|
|
panic(fmt.Errorf("error decoding priority from cloudflare record: %w", err))
|
|
} else {
|
|
priority = uint16(p)
|
|
}
|
|
}
|
|
if err := rc.SetTargetMX(priority, c.Content); err != nil {
|
|
panic(fmt.Errorf("unparsable MX record received from cloudflare: %w", err))
|
|
}
|
|
case "SRV":
|
|
data := *c.Data
|
|
if err := rc.SetTargetSRV(data.Priority, data.Weight, data.Port,
|
|
dnsutil.AddOrigin(data.Target.FQDN(), domain)); err != nil {
|
|
panic(fmt.Errorf("unparsable SRV record received from cloudflare: %w", err))
|
|
}
|
|
default: // "A", "AAAA", "ANAME", "CAA", "CNAME", "NS", "PTR", "TXT"
|
|
if err := rc.PopulateFromString(rType, c.Content, domain); err != nil {
|
|
panic(fmt.Errorf("unparsable record received from cloudflare: %w", err))
|
|
}
|
|
}
|
|
|
|
return rc
|
|
}
|
|
|
|
func getProxyMetadata(r *models.RecordConfig) map[string]string {
|
|
if r.Type != "A" && r.Type != "AAAA" && r.Type != "CNAME" {
|
|
return nil
|
|
}
|
|
var proxied bool
|
|
if r.Original != nil {
|
|
proxied = r.Original.(*cfRecord).Proxied
|
|
} else {
|
|
proxied = r.Metadata[metaProxy] != "off"
|
|
}
|
|
return map[string]string{
|
|
"proxy": fmt.Sprint(proxied),
|
|
}
|
|
}
|
|
|
|
// EnsureDomainExists returns an error of domain does not exist.
|
|
func (c *CloudflareAPI) EnsureDomainExists(domain string) error {
|
|
if _, ok := c.domainIndex[domain]; ok {
|
|
return nil
|
|
}
|
|
var id string
|
|
id, err := c.createZone(domain)
|
|
fmt.Printf("Added zone for %s to Cloudflare account: %s\n", domain, id)
|
|
return err
|
|
}
|