Update github links (#196)

This change updates links to github repositories to incorporate renames
to their default branches.

Signed-off-by: Andrew Harding <[email protected]>

README.md

@@ -2,10 +2,10 @@
 
 This library is a convenient Go library for working with [SPIFFE](https://spiffe.io/).
 
-It leverages the [SPIFFE Workload API](https://github.com/spiffe/spiffe/blob/master/standards/SPIFFE_Workload_API.md), providing high level functionality that includes:
+It leverages the [SPIFFE Workload API](https://github.com/spiffe/spiffe/blob/main/standards/SPIFFE_Workload_API.md), providing high level functionality that includes:
 * Establishing mutually authenticated TLS (__mTLS__) between workloads powered by SPIFFE.
-* Obtaining and validating [X509-SVIDs](https://github.com/spiffe/spiffe/blob/master/standards/X509-SVID.md) and [JWT-SVIDs](https://github.com/spiffe/spiffe/blob/master/standards/JWT-SVID.md).
-* Federating trust between trust domains using [SPIFFE bundles](https://github.com/spiffe/spiffe/blob/master/standards/SPIFFE_Trust_Domain_and_Bundle.md#3-spiffe-bundles).
+* Obtaining and validating [X509-SVIDs](https://github.com/spiffe/spiffe/blob/main/standards/X509-SVID.md) and [JWT-SVIDs](https://github.com/spiffe/spiffe/blob/main/standards/JWT-SVID.md).
+* Federating trust between trust domains using [SPIFFE bundles](https://github.com/spiffe/spiffe/blob/main/standards/SPIFFE_Trust_Domain_and_Bundle.md#3-spiffe-bundles).
 * Bundle management.
 
 ## Documentation
@@ -34,9 +34,9 @@ conn, err := spiffetls.Dial(ctx, "tcp", "127.0.0.1:8443", tlsconfig.AuthorizeAny
 ```
 
 The client and server obtain
-[X509-SVIDs](https://github.com/spiffe/spiffe/blob/master/standards/X509-SVID.md)
+[X509-SVIDs](https://github.com/spiffe/spiffe/blob/main/standards/X509-SVID.md)
 and X.509 bundles from the [SPIFFE Workload
-API](https://github.com/spiffe/spiffe/blob/master/standards/SPIFFE_Workload_API.md).
+API](https://github.com/spiffe/spiffe/blob/main/standards/SPIFFE_Workload_API.md).
 The X509-SVIDs are presented by each peer and authenticated against the X.509
 bundles. Both sides continue to be updated with X509-SVIDs and X.509 bundles
 streamed from the Workload API (e.g. secret rotation).

v2/bundle/spiffebundle/bundle.go

@@ -36,7 +36,7 @@ type bundleDoc struct {
 // Bundle is a collection of trusted public key material for a trust domain,
 // conforming to the SPIFFE Bundle Format as part of the SPIFFE Trust Domain
 // and Bundle specification:
-// https://github.com/spiffe/spiffe/blob/master/standards/SPIFFE_Trust_Domain_and_Bundle.md
+// https://github.com/spiffe/spiffe/blob/main/standards/SPIFFE_Trust_Domain_and_Bundle.md
 type Bundle struct {
 	trustDomain spiffeid.TrustDomain
 
@@ -95,7 +95,7 @@ func Parse(trustDomain spiffeid.TrustDomain, bundleBytes []byte) (*Bundle, error
 
 	if jwks.Keys == nil {
 		// The parameter keys MUST be present.
-		// https://github.com/spiffe/spiffe/blob/master/standards/SPIFFE_Trust_Domain_and_Bundle.md#413-keys
+		// https://github.com/spiffe/spiffe/blob/main/standards/SPIFFE_Trust_Domain_and_Bundle.md#413-keys
 		return nil, spiffebundleErr.New("no authorities found")
 	}
 	for i, key := range jwks.Keys {

v2/examples/spiffe-jwt-using-proxy/client/main.go

@@ -37,7 +37,7 @@ func main() {
 	serverID := spiffeid.RequireFromString("spiffe://example.org/server")
 
 	// By default, this example uses the server's SPIFFE ID as the audience.
-	// It doesn't have to be a SPIFFE ID as long as it follows the JWT-SVID guidelines (https://github.com/spiffe/spiffe/blob/master/standards/JWT-SVID.md#32-audience)
+	// It doesn't have to be a SPIFFE ID as long as it follows the JWT-SVID guidelines (https://github.com/spiffe/spiffe/blob/main/standards/JWT-SVID.md#32-audience)
 	audience := serverID.String()
 	args := os.Args
 	if len(args) >= 2 {

v2/examples/spiffe-jwt/client/main.go

@@ -52,7 +52,7 @@ func main() {
 	}
 
 	// As default example is using server's ID,
-	// It doesn't have to be an SPIFFE ID as long it follows JWT SVIDs the guidelines (https://github.com/spiffe/spiffe/blob/master/standards/JWT-SVID.md#32-audience)
+	// It doesn't have to be an SPIFFE ID as long it follows JWT SVIDs the guidelines (https://github.com/spiffe/spiffe/blob/main/standards/JWT-SVID.md#32-audience)
 	audience := serverID.String()
 	args := os.Args
 	if len(args) >= 2 {

v2/federation/handler.go

@@ -26,7 +26,7 @@ func WithLogger(log logger.Logger) HandlerOption {
 // source is used to obtain the bundle on each request. Source implementations
 // should consider a caching strategy if retrieval is expensive.
 // See the specification for more details:
-// https://github.com/spiffe/spiffe/blob/master/standards/SPIFFE_Trust_Domain_and_Bundle.md
+// https://github.com/spiffe/spiffe/blob/main/standards/SPIFFE_Trust_Domain_and_Bundle.md
 func NewHandler(trustDomain spiffeid.TrustDomain, source spiffebundle.Source, opts ...HandlerOption) (http.Handler, error) {
 	conf := &handlerConfig{
 		log: logger.Null,

v2/workloadapi/x509context.go

@@ -17,7 +17,7 @@ type X509Context struct {
 // Default returns the default X509-SVID (the first in the list).
 //
 // See the SPIFFE Workload API standard Section 5.3.
-// (https://github.com/spiffe/spiffe/blob/master/standards/SPIFFE_Workload_API.md#53-default-identity)
+// (https://github.com/spiffe/spiffe/blob/main/standards/SPIFFE_Workload_API.md#53-default-identity)
 func (x *X509Context) DefaultSVID() *x509svid.SVID {
 	return x.SVIDs[0]
 }