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| 1 | +/** |
| 2 | + * @license |
| 3 | + * Copyright 2025 Google LLC |
| 4 | + * |
| 5 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | + * you may not use this file except in compliance with the License. |
| 7 | + * You may obtain a copy of the License at |
| 8 | + * |
| 9 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | + * |
| 11 | + * Unless required by applicable law or agreed to in writing, software |
| 12 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | + * See the License for the specific language governing permissions and |
| 15 | + * limitations under the License. |
| 16 | + */ |
| 17 | + |
| 18 | +const { writeFile, readFile } = require('node:fs/promises'); |
| 19 | +const { pathToFileURL } = require('node:url'); |
| 20 | +const { isAbsolute, join } = require('node:path'); |
| 21 | + |
| 22 | +const ENV_VARIABLE = 'FIREBASE_WEBAPP_CONFIG'; |
| 23 | + |
| 24 | +async function getPartialConfig() { |
| 25 | + const envVariable = process.env[ENV_VARIABLE]?.trim(); |
| 26 | + |
| 27 | + if (!envVariable) { |
| 28 | + return undefined; |
| 29 | + } |
| 30 | + |
| 31 | + // Like FIREBASE_CONFIG (admin autoinit) FIREBASE_WEBAPP_CONFIG can be |
| 32 | + // either a JSON representation of FirebaseOptions or the path to a filename |
| 33 | + if (envVariable.startsWith('{"')) { |
| 34 | + try { |
| 35 | + return JSON.parse(envVariable); |
| 36 | + } catch (e) { |
| 37 | + console.warn( |
| 38 | + `JSON payload in \$${ENV_VARIABLE} could not be parsed, ignoring.\n`, |
| 39 | + e |
| 40 | + ); |
| 41 | + return undefined; |
| 42 | + } |
| 43 | + } |
| 44 | + |
| 45 | + const fileURL = pathToFileURL( |
| 46 | + isAbsolute(envVariable) ? envVariable : join(process.cwd(), envVariable) |
| 47 | + ); |
| 48 | + |
| 49 | + try { |
| 50 | + const fileContents = await readFile(fileURL, 'utf-8'); |
| 51 | + return JSON.parse(fileContents); |
| 52 | + } catch (e) { |
| 53 | + console.warn( |
| 54 | + `Contents of "${envVariable}" could not be parsed, ignoring \$${ENV_VARIABLE}.\n`, |
| 55 | + e |
| 56 | + ); |
| 57 | + return undefined; |
| 58 | + } |
| 59 | +} |
| 60 | + |
| 61 | +async function getFinalConfig(partialConfig) { |
| 62 | + if (!partialConfig) { |
| 63 | + return undefined; |
| 64 | + } |
| 65 | + // In Firebase App Hosting the config provided to the environment variable is up-to-date and |
| 66 | + // "complete" we should not reach out to the webConfig endpoint to freshen it |
| 67 | + if (process.env.X_GOOGLE_TARGET_PLATFORM === 'fah') { |
| 68 | + return partialConfig; |
| 69 | + } |
| 70 | + const projectId = partialConfig.projectId || '-'; |
| 71 | + // If the projectId starts with demo- this is an demo project from the firebase emulators |
| 72 | + // treat the config as whole |
| 73 | + if (projectId.startsWith('demo-')) { |
| 74 | + return partialConfig; |
| 75 | + } |
| 76 | + const appId = partialConfig.appId; |
| 77 | + const apiKey = partialConfig.apiKey; |
| 78 | + if (!appId || !apiKey) { |
| 79 | + console.warn( |
| 80 | + `Unable to fetch Firebase config, appId and apiKey are required, ignoring \$${ENV_VARIABLE}.` |
| 81 | + ); |
| 82 | + return undefined; |
| 83 | + } |
| 84 | + |
| 85 | + const url = `https://firebase.googleapis.com/v1alpha/projects/${projectId}/apps/${appId}/webConfig`; |
| 86 | + |
| 87 | + try { |
| 88 | + const response = await fetch(url, { |
| 89 | + headers: { 'x-goog-api-key': apiKey } |
| 90 | + }); |
| 91 | + if (!response.ok) { |
| 92 | + console.warn( |
| 93 | + `Unable to fetch Firebase config, ignoring \$${ENV_VARIABLE}.` |
| 94 | + ); |
| 95 | + console.warn( |
| 96 | + `${url} returned ${response.statusText} (${response.status})` |
| 97 | + ); |
| 98 | + try { |
| 99 | + console.warn((await response.json()).error.message); |
| 100 | + } catch (e) {} |
| 101 | + return undefined; |
| 102 | + } |
| 103 | + const json = await response.json(); |
| 104 | + return { ...json, apiKey }; |
| 105 | + } catch (e) { |
| 106 | + console.warn( |
| 107 | + `Unable to fetch Firebase config, ignoring \$${ENV_VARIABLE}.\n`, |
| 108 | + e |
| 109 | + ); |
| 110 | + return undefined; |
| 111 | + } |
| 112 | +} |
| 113 | + |
| 114 | +function handleUnexpectedError(e) { |
| 115 | + console.warn( |
| 116 | + `Unexpected error encountered in @firebase/util postinstall script, ignoring \$${ENV_VARIABLE}.` |
| 117 | + ); |
| 118 | + console.warn(e); |
| 119 | + process.exit(0); |
| 120 | +} |
| 121 | + |
| 122 | +getPartialConfig() |
| 123 | + .catch(handleUnexpectedError) |
| 124 | + .then(getFinalConfig) |
| 125 | + .catch(handleUnexpectedError) |
| 126 | + .then(async finalConfig => { |
| 127 | + const defaults = finalConfig && { |
| 128 | + config: finalConfig, |
| 129 | + emulatorHosts: { |
| 130 | + firestore: process.env.FIRESTORE_EMULATOR_HOST, |
| 131 | + database: process.env.FIREBASE_DATABASE_EMULATOR_HOST, |
| 132 | + storage: process.env.FIREBASE_STORAGE_EMULATOR_HOST, |
| 133 | + auth: process.env.FIREBASE_AUTH_EMULATOR_HOST |
| 134 | + } |
| 135 | + }; |
| 136 | + |
| 137 | + await Promise.all([ |
| 138 | + writeFile( |
| 139 | + join(__dirname, 'dist', 'postinstall.js'), |
| 140 | + `'use strict'; |
| 141 | +Object.defineProperty(exports, '__esModule', { value: true }); |
| 142 | +exports.getDefaultsFromPostinstall = () => (${JSON.stringify(defaults)});` |
| 143 | + ), |
| 144 | + writeFile( |
| 145 | + join(__dirname, 'dist', 'postinstall.mjs'), |
| 146 | + `const getDefaultsFromPostinstall = () => (${JSON.stringify(defaults)}); |
| 147 | +export { getDefaultsFromPostinstall };` |
| 148 | + ) |
| 149 | + ]); |
| 150 | + |
| 151 | + process.exit(0); |
| 152 | + }) |
| 153 | + .catch(handleUnexpectedError); |
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