Add extracted source directory and README navigation

extracted-source/node_modules/@grpc/grpc-js/build/src/call-credentials.js

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+"use strict";
+/*
+ * Copyright 2019 gRPC authors.
+ *
+ * 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.
+ *
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.CallCredentials = void 0;
+const metadata_1 = require("./metadata");
+function isCurrentOauth2Client(client) {
+    return ('getRequestHeaders' in client &&
+        typeof client.getRequestHeaders === 'function');
+}
+/**
+ * A class that represents a generic method of adding authentication-related
+ * metadata on a per-request basis.
+ */
+class CallCredentials {
+    /**
+     * Creates a new CallCredentials object from a given function that generates
+     * Metadata objects.
+     * @param metadataGenerator A function that accepts a set of options, and
+     * generates a Metadata object based on these options, which is passed back
+     * to the caller via a supplied (err, metadata) callback.
+     */
+    static createFromMetadataGenerator(metadataGenerator) {
+        return new SingleCallCredentials(metadataGenerator);
+    }
+    /**
+     * Create a gRPC credential from a Google credential object.
+     * @param googleCredentials The authentication client to use.
+     * @return The resulting CallCredentials object.
+     */
+    static createFromGoogleCredential(googleCredentials) {
+        return CallCredentials.createFromMetadataGenerator((options, callback) => {
+            let getHeaders;
+            if (isCurrentOauth2Client(googleCredentials)) {
+                getHeaders = googleCredentials.getRequestHeaders(options.service_url);
+            }
+            else {
+                getHeaders = new Promise((resolve, reject) => {
+                    googleCredentials.getRequestMetadata(options.service_url, (err, headers) => {
+                        if (err) {
+                            reject(err);
+                            return;
+                        }
+                        if (!headers) {
+                            reject(new Error('Headers not set by metadata plugin'));
+                            return;
+                        }
+                        resolve(headers);
+                    });
+                });
+            }
+            getHeaders.then(headers => {
+                const metadata = new metadata_1.Metadata();
+                for (const key of Object.keys(headers)) {
+                    metadata.add(key, headers[key]);
+                }
+                callback(null, metadata);
+            }, err => {
+                callback(err);
+            });
+        });
+    }
+    static createEmpty() {
+        return new EmptyCallCredentials();
+    }
+}
+exports.CallCredentials = CallCredentials;
+class ComposedCallCredentials extends CallCredentials {
+    constructor(creds) {
+        super();
+        this.creds = creds;
+    }
+    async generateMetadata(options) {
+        const base = new metadata_1.Metadata();
+        const generated = await Promise.all(this.creds.map(cred => cred.generateMetadata(options)));
+        for (const gen of generated) {
+            base.merge(gen);
+        }
+        return base;
+    }
+    compose(other) {
+        return new ComposedCallCredentials(this.creds.concat([other]));
+    }
+    _equals(other) {
+        if (this === other) {
+            return true;
+        }
+        if (other instanceof ComposedCallCredentials) {
+            return this.creds.every((value, index) => value._equals(other.creds[index]));
+        }
+        else {
+            return false;
+        }
+    }
+}
+class SingleCallCredentials extends CallCredentials {
+    constructor(metadataGenerator) {
+        super();
+        this.metadataGenerator = metadataGenerator;
+    }
+    generateMetadata(options) {
+        return new Promise((resolve, reject) => {
+            this.metadataGenerator(options, (err, metadata) => {
+                if (metadata !== undefined) {
+                    resolve(metadata);
+                }
+                else {
+                    reject(err);
+                }
+            });
+        });
+    }
+    compose(other) {
+        return new ComposedCallCredentials([this, other]);
+    }
+    _equals(other) {
+        if (this === other) {
+            return true;
+        }
+        if (other instanceof SingleCallCredentials) {
+            return this.metadataGenerator === other.metadataGenerator;
+        }
+        else {
+            return false;
+        }
+    }
+}
+class EmptyCallCredentials extends CallCredentials {
+    generateMetadata(options) {
+        return Promise.resolve(new metadata_1.Metadata());
+    }
+    compose(other) {
+        return other;
+    }
+    _equals(other) {
+        return other instanceof EmptyCallCredentials;
+    }
+}
+//# sourceMappingURL=call-credentials.js.map