adds API endpoints to manage OAuth2 Application (list/create/delete) (#10437)

* add API endpoint to create OAuth2 Application.

* move endpoint to /user. Add swagger documentations and proper response type.

* change json tags to snake_case. add CreateOAuth2ApplicationOptions to swagger docs.

* change response status to Created (201)

* add methods to list OAuth2 apps and delete an existing OAuth2 app by ID.

* add APIFormat convert method and file header

* fixed header

* hide secret on oauth2 application list

* add Created time to API response

* add API integration tests for create/list/delete OAuth2 applications.

Co-authored-by: techknowlogick <matti@mdranta.net>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: guillep2k <18600385+guillep2k@users.noreply.github.com>

templates/swagger/v1_json.tmpl

@@ -8071,6 +8071,89 @@
         }
       }
     },
+    "/user/applications/oauth2": {
+      "get": {
+        "produces": [
+          "application/json"
+        ],
+        "tags": [
+          "user"
+        ],
+        "summary": "List the authenticated user's oauth2 applications",
+        "operationId": "userGetOauth2Application",
+        "parameters": [
+          {
+            "type": "integer",
+            "description": "page number of results to return (1-based)",
+            "name": "page",
+            "in": "query"
+          },
+          {
+            "type": "integer",
+            "description": "page size of results, maximum page size is 50",
+            "name": "limit",
+            "in": "query"
+          }
+        ],
+        "responses": {
+          "200": {
+            "$ref": "#/responses/OAuth2ApplicationList"
+          }
+        }
+      },
+      "post": {
+        "produces": [
+          "application/json"
+        ],
+        "tags": [
+          "user"
+        ],
+        "summary": "creates a new OAuth2 application",
+        "operationId": "userCreateOAuth2Application",
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/CreateOAuth2ApplicationOptions"
+            }
+          }
+        ],
+        "responses": {
+          "201": {
+            "$ref": "#/responses/OAuth2Application"
+          }
+        }
+      }
+    },
+    "/user/applications/oauth2/{id}": {
+      "delete": {
+        "produces": [
+          "application/json"
+        ],
+        "tags": [
+          "user"
+        ],
+        "summary": "delete an OAuth2 Application",
+        "operationId": "userDeleteOAuth2Application",
+        "parameters": [
+          {
+            "type": "integer",
+            "format": "int64",
+            "description": "token to be deleted",
+            "name": "id",
+            "in": "path",
+            "required": true
+          }
+        ],
+        "responses": {
+          "204": {
+            "$ref": "#/responses/empty"
+          }
+        }
+      }
+    },
     "/user/emails": {
       "get": {
         "produces": [
@@ -10357,6 +10440,24 @@
       },
       "x-go-package": "code.gitea.io/gitea/modules/structs"
     },
+    "CreateOAuth2ApplicationOptions": {
+      "description": "CreateOAuth2ApplicationOptions holds options to create an oauth2 application",
+      "type": "object",
+      "properties": {
+        "name": {
+          "type": "string",
+          "x-go-name": "Name"
+        },
+        "redirect_uris": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "x-go-name": "RedirectURIs"
+        }
+      },
+      "x-go-package": "code.gitea.io/gitea/modules/structs"
+    },
     "CreateOrgOption": {
       "description": "CreateOrgOption options for creating an organization",
       "type": "object",
@@ -12198,6 +12299,42 @@
       },
       "x-go-package": "code.gitea.io/gitea/modules/structs"
     },
+    "OAuth2Application": {
+      "type": "object",
+      "title": "OAuth2Application represents an OAuth2 application.",
+      "properties": {
+        "client_id": {
+          "type": "string",
+          "x-go-name": "ClientID"
+        },
+        "client_secret": {
+          "type": "string",
+          "x-go-name": "ClientSecret"
+        },
+        "created": {
+          "type": "string",
+          "format": "date-time",
+          "x-go-name": "Created"
+        },
+        "id": {
+          "type": "integer",
+          "format": "int64",
+          "x-go-name": "ID"
+        },
+        "name": {
+          "type": "string",
+          "x-go-name": "Name"
+        },
+        "redirect_uris": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "x-go-name": "RedirectURIs"
+        }
+      },
+      "x-go-package": "code.gitea.io/gitea/modules/structs"
+    },
     "Organization": {
       "description": "Organization represents an organization",
       "type": "object",
@@ -13689,6 +13826,21 @@
         }
       }
     },
+    "OAuth2Application": {
+      "description": "OAuth2Application",
+      "schema": {
+        "$ref": "#/definitions/OAuth2Application"
+      }
+    },
+    "OAuth2ApplicationList": {
+      "description": "OAuth2ApplicationList represents a list of OAuth2 applications.",
+      "schema": {
+        "type": "array",
+        "items": {
+          "$ref": "#/definitions/OAuth2Application"
+        }
+      }
+    },
     "Organization": {
       "description": "Organization",
       "schema": {
@@ -13971,7 +14123,7 @@
     "parameterBodies": {
       "description": "parameterBodies",
       "schema": {
-        "$ref": "#/definitions/EditBranchProtectionOption"
+        "$ref": "#/definitions/CreateOAuth2ApplicationOptions"
       }
     },
     "redirect": {