Add an api endpoint to fetch git notes (#15373) (#16649)

close #15373

templates/swagger/v1_json.tmpl

@@ -3569,6 +3569,52 @@
         }
       }
     },
+    "/repos/{owner}/{repo}/git/notes/{sha}": {
+      "get": {
+        "produces": [
+          "application/json"
+        ],
+        "tags": [
+          "repository"
+        ],
+        "summary": "Get a note corresponding to a single commit from a repository",
+        "operationId": "repoGetNote",
+        "parameters": [
+          {
+            "type": "string",
+            "description": "owner of the repo",
+            "name": "owner",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "string",
+            "description": "name of the repo",
+            "name": "repo",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "string",
+            "description": "a git ref or commit sha",
+            "name": "sha",
+            "in": "path",
+            "required": true
+          }
+        ],
+        "responses": {
+          "200": {
+            "$ref": "#/responses/Note"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
+          }
+        }
+      }
+    },
     "/repos/{owner}/{repo}/git/refs": {
       "get": {
         "produces": [
@@ -15453,6 +15499,20 @@
       },
       "x-go-package": "code.gitea.io/gitea/modules/structs"
     },
+    "Note": {
+      "description": "Note contains information related to a git note",
+      "type": "object",
+      "properties": {
+        "commit": {
+          "$ref": "#/definitions/Commit"
+        },
+        "message": {
+          "type": "string",
+          "x-go-name": "Message"
+        }
+      },
+      "x-go-package": "code.gitea.io/gitea/modules/structs"
+    },
     "NotificationCount": {
       "description": "NotificationCount number of unread notifications",
       "type": "object",
@@ -17412,6 +17472,12 @@
         }
       }
     },
+    "Note": {
+      "description": "Note",
+      "schema": {
+        "$ref": "#/definitions/Note"
+      }
+    },
     "NotificationCount": {
       "description": "Number of unread notifications",
       "schema": {