Remove openpgp and change CreateCommit signature (#2935)

Fixes: #2932.

example/commitpr/main.go

@@ -21,15 +21,18 @@
 package main
 
 import (
+	"bytes"
 	"context"
 	"errors"
 	"flag"
 	"fmt"
+	"io"
 	"log"
 	"os"
 	"strings"
 	"time"
 
+	"github.com/ProtonMail/go-crypto/openpgp"
 	"github.com/google/go-github/v55/github"
 )
 
@@ -51,6 +54,7 @@ If the file should be in the same location with the same name, you can just put
 Example: README.md,main.go:github/examples/commitpr/main.go`)
 	authorName  = flag.String("author-name", "", "Name of the author of the commit.")
 	authorEmail = flag.String("author-email", "", "Email of the author of the commit.")
+	privateKey  = flag.String("private-key", "", "Path to the private key to use to sign the commit.")
 )
 
 var client *github.Client
@@ -135,7 +139,25 @@ func pushCommit(ref *github.Reference, tree *github.Tree) (err error) {
 	date := time.Now()
 	author := &github.CommitAuthor{Date: &github.Timestamp{Time: date}, Name: authorName, Email: authorEmail}
 	commit := &github.Commit{Author: author, Message: commitMessage, Tree: tree, Parents: []*github.Commit{parent.Commit}}
-	newCommit, _, err := client.Git.CreateCommit(ctx, *sourceOwner, *sourceRepo, commit)
+	opts := github.CreateCommitOptions{}
+	if *privateKey != "" {
+		armoredBlock, e := os.ReadFile(*privateKey)
+		if e != nil {
+			return e
+		}
+		keyring, e := openpgp.ReadArmoredKeyRing(bytes.NewReader(armoredBlock))
+		if e != nil {
+			return e
+		}
+		if len(keyring) != 1 {
+			return errors.New("expected exactly one key in the keyring")
+		}
+		key := keyring[0]
+		opts.Signer = github.MessageSignerFunc(func(w io.Writer, r io.Reader) error {
+			return openpgp.ArmoredDetachSign(w, key, r, nil)
+		})
+	}
+	newCommit, _, err := client.Git.CreateCommit(ctx, *sourceOwner, *sourceRepo, commit, &opts)
 	if err != nil {
 		return err
 	}

example/go.mod

@@ -3,6 +3,7 @@ module github.com/google/go-github/v55/example
 go 1.17
 
 require (
+	github.com/ProtonMail/go-crypto v0.0.0-20230828082145-3c4c8a2d2371
 	github.com/bradleyfalzon/ghinstallation/v2 v2.0.4
 	github.com/gofri/go-github-ratelimit v1.0.3
 	github.com/google/go-github/v55 v55.0.0
@@ -12,7 +13,6 @@ require (
 )
 
 require (
-	github.com/ProtonMail/go-crypto v0.0.0-20230217124315-7d5c6f04bbb8 // indirect
 	github.com/cloudflare/circl v1.3.3 // indirect
 	github.com/golang-jwt/jwt/v4 v4.0.0 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect

example/go.sum

@@ -1,9 +1,8 @@
-github.com/ProtonMail/go-crypto v0.0.0-20230217124315-7d5c6f04bbb8 h1:wPbRQzjjwFc0ih8puEVAOFGELsn1zoIIYdxvML7mDxA=
-github.com/ProtonMail/go-crypto v0.0.0-20230217124315-7d5c6f04bbb8/go.mod h1:I0gYDMZ6Z5GRU7l58bNFSkPTFN6Yl12dsUlAZ8xy98g=
+github.com/ProtonMail/go-crypto v0.0.0-20230828082145-3c4c8a2d2371 h1:kkhsdkhsCvIsutKu5zLMgWtgh9YxGCNAw8Ad8hjwfYg=
+github.com/ProtonMail/go-crypto v0.0.0-20230828082145-3c4c8a2d2371/go.mod h1:EjAoLdwvbIOoOQr3ihjnSoLZRtE8azugULFRteWMNc0=
 github.com/bradleyfalzon/ghinstallation/v2 v2.0.4 h1:tXKVfhE7FcSkhkv0UwkLvPDeZ4kz6OXd0PKPlFqf81M=
 github.com/bradleyfalzon/ghinstallation/v2 v2.0.4/go.mod h1:B40qPqJxWE0jDZgOR1JmaMy+4AY1eBP+IByOvqyAKp0=
-github.com/bwesterb/go-ristretto v1.2.0/go.mod h1:fUIoIZaG73pV5biE2Blr2xEzDoMj7NFEuV9ekS419A0=
-github.com/cloudflare/circl v1.1.0/go.mod h1:prBCrKB9DV4poKZY1l9zBXg2QJY7mvgRvtMxxK7fi4I=
+github.com/bwesterb/go-ristretto v1.2.3/go.mod h1:fUIoIZaG73pV5biE2Blr2xEzDoMj7NFEuV9ekS419A0=
 github.com/cloudflare/circl v1.3.3 h1:fE/Qz0QdIGqeWfnwq0RE0R7MI51s0M2E4Ga9kq5AEMs=
 github.com/cloudflare/circl v1.3.3/go.mod h1:5XYMA4rFBvNIrhs50XuiBJ15vF2pZn4nnUKZrLbUZFA=
 github.com/gofri/go-github-ratelimit v1.0.3 h1:Ocs2jaYokZDzgvqaajX+g04dqFyVqL0JQzoO7d2wmlk=
@@ -23,29 +22,59 @@ github.com/google/go-github/v41 v41.0.0 h1:HseJrM2JFf2vfiZJ8anY2hqBjdfY1Vlj/K27u
 github.com/google/go-github/v41 v41.0.0/go.mod h1:XgmCA5H323A9rtgExdTcnDkcqp6S30AVACCBDOonIxg=
 github.com/google/go-querystring v1.1.0 h1:AnCroh3fv4ZBgVIf1Iwtovgjaw/GiKJo8M8yD/fhyJ8=
 github.com/google/go-querystring v1.1.0/go.mod h1:Kcdr2DB4koayq7X8pmAG4sNG59So17icRSOU623lUBU=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20210817164053-32db794688a5/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.3.1-0.20221117191849-2c476679df9a/go.mod h1:hebNnKkNXi2UzZN1eVRvBB7co0a+JxK6XbPiWVs/3J4=
+golang.org/x/crypto v0.7.0/go.mod h1:pYwdfH91IfpZVANVyUOhSIPZaFoJGxTFbZhFTx+dXZU=
 golang.org/x/crypto v0.12.0 h1:tFM/ta59kqch6LlvYnPa0yx5a83cL2nHflFhYKvv9Yk=
 golang.org/x/crypto v0.12.0/go.mod h1:NF0Gs7EO5K4qLn+Ylc+fih8BSTeIjAP05siRnAh98yw=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
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+golang.org/x/net v0.2.0/go.mod h1:KqCZLdyyvdV855qA2rE3GC2aiw5xGR5TEjj8smXukLY=
+golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
+golang.org/x/net v0.8.0/go.mod h1:QVkue5JL9kW//ek3r6jTKnTFis1tRmNAW2P1shuFdJc=
 golang.org/x/net v0.10.0 h1:X2//UzNDwYmtCLn7To6G58Wr6f5ahEAQgKNzv9Y951M=
 golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
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+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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+golang.org/x/sys v0.3.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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 golang.org/x/sys v0.11.0 h1:eG7RXZHdqOJ1i+0lgLgCpSXAp6M3LYlAo6osgSi0xOM=
 golang.org/x/sys v0.11.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
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 golang.org/x/term v0.11.0 h1:F9tnn/DA/Im8nCwm+fX+1/eBwi4qFjRT++MhtVC4ZX0=
 golang.org/x/term v0.11.0/go.mod h1:zC9APTIj3jG3FdV/Ons+XE1riIZXG4aZ4GTHiPZJPIU=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
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 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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example/newreposecretwithlibsodium/go.sum

@@ -1,62 +1,8 @@
 github.com/GoKillers/libsodium-go v0.0.0-20171022220152-dd733721c3cb h1:ilqSFSbR1fq6x88heeHrvAqlg+ES+tZk2ZcaCmiH1gI=
 github.com/GoKillers/libsodium-go v0.0.0-20171022220152-dd733721c3cb/go.mod h1:72TQeEkiDH9QMXZa5nJJvZre0UjqqO67X2QEIoOwCRU=
-github.com/ProtonMail/go-crypto v0.0.0-20230217124315-7d5c6f04bbb8 h1:wPbRQzjjwFc0ih8puEVAOFGELsn1zoIIYdxvML7mDxA=
-github.com/ProtonMail/go-crypto v0.0.0-20230217124315-7d5c6f04bbb8/go.mod h1:I0gYDMZ6Z5GRU7l58bNFSkPTFN6Yl12dsUlAZ8xy98g=
-github.com/bwesterb/go-ristretto v1.2.0/go.mod h1:fUIoIZaG73pV5biE2Blr2xEzDoMj7NFEuV9ekS419A0=
-github.com/bwesterb/go-ristretto v1.2.3/go.mod h1:fUIoIZaG73pV5biE2Blr2xEzDoMj7NFEuV9ekS419A0=
-github.com/cloudflare/circl v1.1.0/go.mod h1:prBCrKB9DV4poKZY1l9zBXg2QJY7mvgRvtMxxK7fi4I=
-github.com/cloudflare/circl v1.3.3 h1:fE/Qz0QdIGqeWfnwq0RE0R7MI51s0M2E4Ga9kq5AEMs=
-github.com/cloudflare/circl v1.3.3/go.mod h1:5XYMA4rFBvNIrhs50XuiBJ15vF2pZn4nnUKZrLbUZFA=
 github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
 github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
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-github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
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-golang.org/x/sys v0.3.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.11.0 h1:eG7RXZHdqOJ1i+0lgLgCpSXAp6M3LYlAo6osgSi0xOM=
-golang.org/x/sys v0.11.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
-golang.org/x/term v0.2.0/go.mod h1:TVmDHMZPmdnySmBfhjOoOdhjzdE1h4u1VwSiw2l1Nuc=
-golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
-golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
-golang.org/x/term v0.11.0/go.mod h1:zC9APTIj3jG3FdV/Ons+XE1riIZXG4aZ4GTHiPZJPIU=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/text v0.4.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
-golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
-golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
-golang.org/x/text v0.12.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
-golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

github/git_commits.go

@@ -10,9 +10,8 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"io"
 	"strings"
-
-	"github.com/ProtonMail/go-crypto/openpgp"
 )
 
 // SignatureVerification represents GPG signature verification.
@@ -23,6 +22,25 @@ type SignatureVerification struct {
 	Payload   *string `json:"payload,omitempty"`
 }
 
+// MessageSigner is used by GitService.CreateCommit to sign a commit.
+//
+// To create a MessageSigner that signs a commit with a [golang.org/x/crypto/openpgp.Entity],
+// or [github.com/ProtonMail/go-crypto/openpgp.Entity], use:
+//
+//	commit.Signer = github.MessageSignerFunc(func(w io.Writer, r io.Reader) error {
+//		return openpgp.ArmoredDetachSign(w, openpgpEntity, r, nil)
+//	})
+type MessageSigner interface {
+	Sign(w io.Writer, r io.Reader) error
+}
+
+// MessageSignerFunc is a single function implementation of MessageSigner.
+type MessageSignerFunc func(w io.Writer, r io.Reader) error
+
+func (f MessageSignerFunc) Sign(w io.Writer, r io.Reader) error {
+	return f(w, r)
+}
+
 // Commit represents a GitHub commit.
 type Commit struct {
 	SHA          *string                `json:"sha,omitempty"`
@@ -41,11 +59,6 @@ type Commit struct {
 	// is only populated for requests that fetch GitHub data like
 	// Pulls.ListCommits, Repositories.ListCommits, etc.
 	CommentCount *int `json:"comment_count,omitempty"`
-
-	// SigningKey denotes a key to sign the commit with. If not nil this key will
-	// be used to sign the commit. The private key must be present and already
-	// decrypted. Ignored if Verification.Signature is defined.
-	SigningKey *openpgp.Entity `json:"-"`
 }
 
 func (c Commit) String() string {
@@ -96,6 +109,12 @@ type createCommit struct {
 	Signature *string       `json:"signature,omitempty"`
 }
 
+type CreateCommitOptions struct {
+	// CreateCommit will sign the commit with this signer. See MessageSigner doc for more details.
+	// Ignored on commits where Verification.Signature is defined.
+	Signer MessageSigner
+}
+
 // CreateCommit creates a new commit in a repository.
 // commit must not be nil.
 //
@@ -104,10 +123,13 @@ type createCommit struct {
 // the authenticated user’s information and the current date.
 //
 // GitHub API docs: https://docs.github.com/en/rest/git/commits#create-a-commit
-func (s *GitService) CreateCommit(ctx context.Context, owner string, repo string, commit *Commit) (*Commit, *Response, error) {
+func (s *GitService) CreateCommit(ctx context.Context, owner string, repo string, commit *Commit, opts *CreateCommitOptions) (*Commit, *Response, error) {
 	if commit == nil {
 		return nil, nil, fmt.Errorf("commit must be provided")
 	}
+	if opts == nil {
+		opts = &CreateCommitOptions{}
+	}
 
 	u := fmt.Sprintf("repos/%v/%v/git/commits", owner, repo)
 
@@ -125,16 +147,16 @@ func (s *GitService) CreateCommit(ctx context.Context, owner string, repo string
 	if commit.Tree != nil {
 		body.Tree = commit.Tree.SHA
 	}
-	if commit.SigningKey != nil {
-		signature, err := createSignature(commit.SigningKey, body)
+	switch {
+	case commit.Verification != nil:
+		body.Signature = commit.Verification.Signature
+	case opts.Signer != nil:
+		signature, err := createSignature(opts.Signer, body)
 		if err != nil {
 			return nil, nil, err
 		}
 		body.Signature = &signature
 	}
-	if commit.Verification != nil {
-		body.Signature = commit.Verification.Signature
-	}
 
 	req, err := s.client.NewRequest("POST", u, body)
 	if err != nil {
@@ -150,8 +172,8 @@ func (s *GitService) CreateCommit(ctx context.Context, owner string, repo string
 	return c, resp, nil
 }
 
-func createSignature(signingKey *openpgp.Entity, commit *createCommit) (string, error) {
-	if signingKey == nil || commit == nil {
+func createSignature(signer MessageSigner, commit *createCommit) (string, error) {
+	if signer == nil {
 		return "", errors.New("createSignature: invalid parameters")
 	}
 
@@ -160,9 +182,9 @@ func createSignature(signingKey *openpgp.Entity, commit *createCommit) (string,
 		return "", err
 	}
 
-	writer := new(bytes.Buffer)
-	reader := bytes.NewReader([]byte(message))
-	if err := openpgp.ArmoredDetachSign(writer, signingKey, reader, nil); err != nil {
+	var writer bytes.Buffer
+	err = signer.Sign(&writer, strings.NewReader(message))
+	if err != nil {
 		return "", err
 	}