1 files changed, 51 insertions, 0 deletions
diff --git a/modules/setting/federation.go b/modules/setting/federation.go
new file mode 100644
index 00000000..2bea9006
--- /dev/null
+++ b/modules/setting/federation.go
@@ -0,0 +1,51 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package setting
+
+import (
+	"code.gitea.io/gitea/modules/log"
+
+	"github.com/go-fed/httpsig"
+)
+
+// Federation settings
+var (
+	Federation = struct {
+		Enabled             bool
+		ShareUserStatistics bool
+		MaxSize             int64
+		Algorithms          []string
+		DigestAlgorithm     string
+		GetHeaders          []string
+		PostHeaders         []string
+	}{
+		Enabled:             false,
+		ShareUserStatistics: true,
+		MaxSize:             4,
+		Algorithms:          []string{"rsa-sha256", "rsa-sha512", "ed25519"},
+		DigestAlgorithm:     "SHA-256",
+		GetHeaders:          []string{"(request-target)", "Date"},
+		PostHeaders:         []string{"(request-target)", "Date", "Digest"},
+	}
+)
+
+// HttpsigAlgs is a constant slice of httpsig algorithm objects
+var HttpsigAlgs []httpsig.Algorithm
+
+func loadFederationFrom(rootCfg ConfigProvider) {
+	if err := rootCfg.Section("federation").MapTo(&Federation); err != nil {
+		log.Fatal("Failed to map Federation settings: %v", err)
+	} else if !httpsig.IsSupportedDigestAlgorithm(Federation.DigestAlgorithm) {
+		log.Fatal("unsupported digest algorithm: %s", Federation.DigestAlgorithm)
+		return
+	}
+
+	// Get MaxSize in bytes instead of MiB
+	Federation.MaxSize = 1 << 20 * Federation.MaxSize
+
+	HttpsigAlgs = make([]httpsig.Algorithm, len(Federation.Algorithms))
+	for i, alg := range Federation.Algorithms {
+		HttpsigAlgs[i] = httpsig.Algorithm(alg)
+	}
+}