API method to list all commits of a repository (#6408)

* Added API endpoint ListAllCommits (/repos/{owner}/{repo}/git/commits)

Signed-off-by: Mike Schwörer <mailport@mikescher.de>

* Fixed failing drone build

Signed-off-by: Mike Schwörer <mailport@mikescher.de>

* Implemented requested changes (PR reviews)

Signed-off-by: Mike Schwörer <mailport@mikescher.de>

* gofmt

Signed-off-by: Mike Schwörer <mailport@mikescher.de>

* Changed api route from "/repos/{owner}/{repo}/git/commits" to "/repos/{owner}/{repo}/commits"

* Removed unnecessary line

* better error message when git repo is empty

* make generate-swagger

* fixed removed return

* Update routers/api/v1/repo/commits.go

Co-Authored-By: Lauris BH <lauris@nix.lv>

* Update routers/api/v1/repo/commits.go

Co-Authored-By: Lauris BH <lauris@nix.lv>

* go fmt

* Refactored common code into ToCommit()

* made toCommit not exported

* added check for userCache == nil

templates/swagger/v1_json.tmpl

@@ -1556,6 +1556,57 @@
         }
       }
     },
+    "/repos/{owner}/{repo}/commits": {
+      "get": {
+        "produces": [
+          "application/json"
+        ],
+        "tags": [
+          "repository"
+        ],
+        "summary": "Get a list of all commits from a repository",
+        "operationId": "repoGetAllCommits",
+        "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": "SHA or branch to start listing commits from (usually 'master')",
+            "name": "sha",
+            "in": "query"
+          },
+          {
+            "type": "integer",
+            "description": "page number of requested commits",
+            "name": "page",
+            "in": "query"
+          }
+        ],
+        "responses": {
+          "200": {
+            "$ref": "#/responses/CommitList"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
+          },
+          "409": {
+            "$ref": "#/responses/EmptyRepository"
+          }
+        }
+      }
+    },
     "/repos/{owner}/{repo}/commits/{ref}/statuses": {
       "get": {
         "produces": [
@@ -6878,6 +6929,21 @@
     }
   },
   "definitions": {
+    "APIError": {
+      "description": "APIError is an api error with a message",
+      "type": "object",
+      "properties": {
+        "message": {
+          "type": "string",
+          "x-go-name": "Message"
+        },
+        "url": {
+          "type": "string",
+          "x-go-name": "URL"
+        }
+      },
+      "x-go-package": "code.gitea.io/gitea/modules/structs"
+    },
     "AddCollaboratorOption": {
       "description": "AddCollaboratorOption options when adding a user as a collaborator of a repository",
       "type": "object",
@@ -10044,6 +10110,41 @@
         "$ref": "#/definitions/Commit"
       }
     },
+    "CommitList": {
+      "description": "CommitList",
+      "schema": {
+        "type": "array",
+        "items": {
+          "$ref": "#/definitions/Commit"
+        }
+      },
+      "headers": {
+        "X-HasMore": {
+          "type": "boolean",
+          "description": "True if there is another page"
+        },
+        "X-Page": {
+          "type": "integer",
+          "format": "int64",
+          "description": "The current page"
+        },
+        "X-PageCount": {
+          "type": "integer",
+          "format": "int64",
+          "description": "Total number of pages"
+        },
+        "X-PerPage": {
+          "type": "integer",
+          "format": "int64",
+          "description": "Commits per page"
+        },
+        "X-Total": {
+          "type": "integer",
+          "format": "int64",
+          "description": "Total commit count"
+        }
+      }
+    },
     "ContentsListResponse": {
       "description": "ContentsListResponse",
       "schema": {
@@ -10083,6 +10184,12 @@
         }
       }
     },
+    "EmptyRepository": {
+      "description": "EmptyRepository",
+      "schema": {
+        "$ref": "#/definitions/APIError"
+      }
+    },
     "FileDeleteResponse": {
       "description": "FileDeleteResponse",
       "schema": {