catalog(github): add github v3 reader processor

plugins/catalog-backend/src/ingestion/LocationReaders.ts

@@ -26,6 +26,7 @@ import { AnnotateLocationEntityProcessor } from './processors/AnnotateLocationEn
 import { EntityPolicyProcessor } from './processors/EntityPolicyProcessor';
 import { FileReaderProcessor } from './processors/FileReaderProcessor';
 import { GithubReaderProcessor } from './processors/GithubReaderProcessor';
+import { GithubV3ReaderProcessor } from './processors/GithubV3ReaderProcessor';
 import { GitlabReaderProcessor } from './processors/GitlabReaderProcessor';
 import { LocationRefProcessor } from './processors/LocationEntityProcessor';
 import * as result from './processors/results';
@@ -57,6 +58,7 @@ export class LocationReaders implements LocationReader {
     return [
       new FileReaderProcessor(),
       new GithubReaderProcessor(),
+      new GithubV3ReaderProcessor(),
       new GitlabReaderProcessor(),
       new YamlProcessor(),
       new EntityPolicyProcessor(entityPolicy),

plugins/catalog-backend/src/ingestion/processors/GithubV3ReaderProcessor.test.ts

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { GithubV3ReaderProcessor } from './GithubV3ReaderProcessor';
+
+describe('GithubV3ReaderProcessor', () => {
+  // it('should build raw url')
+});

plugins/catalog-backend/src/ingestion/processors/GithubV3ReaderProcessor.ts

@@ -0,0 +1,119 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { LocationSpec } from '@backstage/catalog-model';
+import fetch from 'node-fetch';
+import * as result from './results';
+import { LocationProcessor, LocationProcessorEmit } from './types';
+
+const privateToken = process.env.GITHUB_PRIVATE_TOKEN;
+
+export class GithubV3ReaderProcessor implements LocationProcessor {
+  getRequestOptions(): RequestInit {
+    const requestOptions: RequestInit = {
+      headers: {
+        Accept: 'application/vnd.github.v3.raw',
+      },
+    };
+
+    if (privateToken) {
+      requestOptions.headers.Authorization = `token ${privateToken}`;
+    }
+    return requestOptions;
+  }
+
+  async readLocation(
+    location: LocationSpec,
+    optional: boolean,
+    emit: LocationProcessorEmit,
+  ): Promise<boolean> {
+    if (location.type !== 'github/v3') {
+      return false;
+    }
+
+    try {
+      const url = this.buildRawUrl(location.target);
+
+      const response = await fetch(url.toString(), this.getRequestOptions());
+
+      if (response.ok) {
+        const buffer = await response.buffer();
+
+        emit(result.data(location, buffer));
+      } else {
+        const message = `${location.target} could not be read as ${url}, ${response.status} ${response.statusText}`;
+        if (response.status === 404) {
+          if (!optional) {
+            emit(result.notFoundError(location, message));
+          }
+        } else {
+          emit(result.generalError(location, message));
+        }
+      }
+    } catch (e) {
+      const message = `Unable to read ${location.type} ${location.target}, ${e}`;
+      emit(result.generalError(location, message));
+    }
+
+    return true;
+  }
+
+  // Converts
+  // from: https://github.com/a/b/blob/master/path/to/c.yaml
+  // to:   https://api.github.com/repos/a/b/contents/path/to/c.yaml?ref=master
+  buildRawUrl(target: string): URL {
+    try {
+      const url = new URL(target);
+
+      const [
+        empty,
+        userOrOrg,
+        repoName,
+        blobKeyword,
+        ref,
+        ...restOfPath
+      ] = url.pathname.split('/');
+
+      if (
+        url.hostname !== 'github.com' ||
+        empty !== '' ||
+        userOrOrg === '' ||
+        repoName === '' ||
+        blobKeyword !== 'blob' ||
+        !restOfPath.join('/').match(/\.yaml$/)
+      ) {
+        throw new Error('Wrong GitHub URL');
+      }
+
+      // transform to api
+      url.pathname = [
+        empty,
+        'repos',
+        userOrOrg,
+        repoName,
+        'contents',
+        ...restOfPath,
+      ].join('/');
+      url.hostname = 'api.github.com';
+      url.protocol = 'https';
+      url.search = `ref=${ref}`;
+
+      return url;
+    } catch (e) {
+      throw new Error(`Incorrect url: ${target}, ${e}`);
+    }
+  }
+}

yarn.lock

@@ -3960,13 +3960,6 @@
     "@types/node" "*"
     rollup "^0.63.4"
 
-"@types/sanitize-html@^1.23.3":
-  version "1.23.3"
-  resolved "https://registry.npmjs.org/@types/sanitize-html/-/sanitize-html-1.23.3.tgz#26527783aba3bf195ad8a3c3e51bd3713526fc0d"
-  integrity sha512-Isg8N0ifKdDq6/kaNlIcWfapDXxxquMSk2XC5THsOICRyOIhQGds95XH75/PL/g9mExi4bL8otIqJM/Wo96WxA==
-  dependencies:
-    htmlparser2 "^4.1.0"
-
 "@types/serve-static@*":
   version "1.13.3"
   resolved "https://registry.npmjs.org/@types/serve-static/-/serve-static-1.13.3.tgz#eb7e1c41c4468272557e897e9171ded5e2ded9d1"