tailcfg: rename prototype field to reflect its status

(Added earlier today in #8916, 57da1f150)

Updates tailscale/corp#13969

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

client/tailscale/apitype/controltype.go

@@ -10,7 +10,7 @@ type DNSConfig struct {
 	Domains            []string                 `json:"domains"`
 	Nameservers        []string                 `json:"nameservers"`
 	Proxied            bool                     `json:"proxied"`
-	DNSFilterURL      string                   `json:"DNSFilterURL"`
+	TempCorpIssue13969 string                   `json:"TempCorpIssue13969,omitempty"`
 }
 
 type DNSResolver struct {

tailcfg/tailcfg.go

@@ -1403,8 +1403,11 @@ type DNSConfig struct {
 	//
 	// Matches are case insensitive.
 	ExitNodeFilteredSet []string `json:",omitempty"`
-	// DNSFilterURL contains a user inputed URL that should have a list of domains to be blocked
-	DNSFilterURL string `json:",omitempty"`
+
+	// TempCorpIssue13969 is a temporary (2023-08-16) field for an internal hack day prototype.
+	// It contains a user inputed URL that should have a list of domains to be blocked.
+	// See https://github.com/tailscale/corp/issues/13969.
+	TempCorpIssue13969 string `json:",omitempty"`
 }
 
 // DNSRecord is an extra DNS record to add to MagicDNS.

tailcfg/tailcfg_clone.go

@@ -261,7 +261,7 @@ var _DNSConfigCloneNeedsRegeneration = DNSConfig(struct {
 	CertDomains         []string
 	ExtraRecords        []DNSRecord
 	ExitNodeFilteredSet []string
-	DNSFilterURL        string
+	TempCorpIssue13969  string
 }{})
 
 // Clone makes a deep copy of RegisterResponse.

tailcfg/tailcfg_view.go

@@ -557,7 +557,7 @@ func (v DNSConfigView) ExtraRecords() views.Slice[DNSRecord] { return views.Slic
 func (v DNSConfigView) ExitNodeFilteredSet() views.Slice[string] {
 	return views.SliceOf(v.ж.ExitNodeFilteredSet)
 }
-func (v DNSConfigView) DNSFilterURL() string { return v.ж.DNSFilterURL }
+func (v DNSConfigView) TempCorpIssue13969() string { return v.ж.TempCorpIssue13969 }
 
 // A compilation failure here means this code must be regenerated, with the command at the top of this file.
 var _DNSConfigViewNeedsRegeneration = DNSConfig(struct {
@@ -570,7 +570,7 @@ var _DNSConfigViewNeedsRegeneration = DNSConfig(struct {
 	CertDomains         []string
 	ExtraRecords        []DNSRecord
 	ExitNodeFilteredSet []string
-	DNSFilterURL        string
+	TempCorpIssue13969  string
 }{})
 
 // View returns a readonly view of RegisterResponse.