angular-server-side-configuration

Configure an angular application at runtime on the server or in a docker container via environment variables.
Motivation
The Angular CLI provides build time configuration (via environment.ts).
In a Continuous Delivery environment this is sometimes not enough.
How it works & Limitations
Environment variables are used for configuration.
This package provides an Angular CLI builder to search for usages at build time.
A native CLI can be used to insert populated
environment variables into index.html file(s) into the head tag or by replacing <!--CONFIG-->
(Missing environment variables will be represented by null
). This should be done
on the host serving the bundled angular files.
Version 8 Rewrite
Version 8.x of this package is a complete rewrite with Angular schematics and builders.
If you require support for older Angular versions,
Version 2.x
of this library can be used, as it is Angular version agnostic.
Getting Started
ng add angular-server-side-configuration
or, if you have a previous version of this library installed
ng update angular-server-side-configuration@latest
This will configure the appropriate files.
Alternatively, if you want to configure the files yourself:
npm install --save angular-server-side-configuration
angular.json
Ensure you have an ngsscbuild
entry in your project architect
section.
To use the builder run ng run your-project-name:ngsscbuild:production
.
You can add additional configurations in angular.json, which can be executed
by replacing production
with your configuration name in the previous command.
The builder will analyze the configured ngsscConfigurationFile
to detect
used environment variables and generate an ngssc.json in the defined
outputPath
in the referenced browserTarget
.
...
"projects": {
...
"your-project-name": {
...
"architect": {
...
"ngsscbuild": {
"builder": "angular-server-side-configuration:ngsscbuild",
"options": {
"additionalEnvironmentVariables": ["MANUAL_ENTRIES"],
"aotSupport": true,
"browserTarget": "your-project-name:build",
"ngsscConfigurationFile": "src/environments/environment.prod.ts"
},
"configurations": {
"production": {
"browserTarget": "your-project-name:build:production"
}
}
}
...
}
...
}
...
}
...
To run the ngssc build, run the command ng run your-project-name:ngsscbuild:production
.
environment.prod.ts
angular-server-side-configuration supports two variants for using environment variables:
process.env.* or NG_ENV.*
process.env.*
Use process.env.NAME in your environment.prod.ts, where NAME is the
environment variable that should be used.
import 'angular-server-side-configuration/process';
export const environment = {
production: process.env.PROD !== 'false',
apiAddress: process.env.API_ADDRESS || 'https://example-api.com'
};
NG_ENV.*
Import NG_ENV from angular-server-side-configuration/ng-env
and use NG_ENV.NAME in your environment.prod.ts, where NAME is the
environment variable that should be used.
import { NG_ENV } from 'angular-server-side-configuration/ng-env';
export const environment = {
production: NG_ENV.PROD !== 'false',
apiAddress: NG_ENV.API_ADDRESS || 'https://example-api.com'
};
index.html (Optional)
Add <!--CONFIG-->
to index.html. This will be replaced by the configuration script tag.
This is optional, as the environment variables can be configured to be inserted in the head tag.
It is however the safest option.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Angular Example</title>
<base href="/">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" type="image/x-icon" href="favicon.ico">
</head>
<body>
<app-root></app-root>
</body>
</html>
On host server or in Dockerfile
This library provides a native implementation for the insert
command of the CLI. Go to
Releases
and download the appropriate executable for your server environment.
(See build.sh for
build details of the native CLI. Please open an Issue
if you need an additional environment.)
Thanks to DanielHabenicht for the input and contribution.
ngssc insert
Usage: ngssc insert [options] [directory]
-r, --recursive | Recursively searches for ngssc.json files and applies the contained configuration |
--dry | Perform the insert without actually inserting the variables |
Minimal Example
Dockerfile
FROM nginx:alpine
ADD https://github.com/kyubisation/angular-server-side-configuration/releases/download/v2.0.0/ngssc_64bit /usr/sbin/ngssc
RUN chmod +x /usr/sbin/ngssc
COPY dist /usr/share/nginx/html
COPY start.sh start.sh
RUN chmod +x ./start.sh
CMD ["./start.sh"]
start.sh
#!/bin/sh
ngssc insert /usr/share/nginx/html
nginx -g 'daemon off;'
ngssc.json
The package provides a JSON schema: ngssc.schema.json",
{
"$schema": "./node_modules/angular-server-side-configuration/ngssc.schema.json",
"variant": "process",
"environmentVariables": [],
"filePattern": "**/index.html"
}
License
Apache License, Version 2.0
8.0.0-beta.1 (2019-07-14)
Features
- Added additionalEnvironmentVariables to builder options
- Implemented ng update migration