oniyi-http-plugin-format-url-template

Plugin for injecting template values into request href and/or query string

Install

$ npm install --save oniyi-http-plugin-format-url-template

Usage

const OniyiHttpClient = require('oniyi-http-client');
const oniyiHttpPluginUrlTemplate = require('oniyi-http-plugin-format-url-template');
 
const options = {
  requestPhases: ['initial','format-url-template', 'final'],
};
 
const pluginOptions = {
  valuesMap: {
    authType: {
      oauth: 'myAuthType', // this line overrides default 'myAuthType' type name, and 'myAuthType' will be injected into url if requested
    }
  },
  applyToQueryString: true,
};
 
const plugin = oniyiHttpPluginUrlTemplate(pluginOptions);
const phaseMapOptions = {
  requestPhaseMap: {
    'format-url-template': 'url-template',
  },
  responsePhaseMap: {
    final: 'end',
  },
};
 
const httpClient = OniyiHttpClient
  .create(options)                // create custom http client with defined phases lists
  .use(plugin, phaseMapOptions);  // mount a plugin

These are the default plugin options, they can be overridden as shown above (merged deeply)

const defaultPluginOptions = {
  applyToUrl: true,
  applyToQueryString: false,
  valuesMap: {
    authType: {
      oauth: 'oauth',
      basic: 'basic',
      saml: 'form',
      cookie: 'form',
    },
  },
};

This plugin relies on logic implemented in oniyi-http-client, which has extensive documentation on how phase lists work and what conventions must be followed when implementing a plugin.

Conventions

It is important to follow couple of conventions when defining a request uri:

-- convention 1 --

const requestOptions = {
  auth: {},
  headers: {},
  method: '',
  qs: {},
  uri: 'my/custom/{ authType }/path',
}

{ authType } can be placed anywhere within uri/url. Valid template string:

1. {authType}
2. {authType }
3. { authType}
4. { authType }

{authType} does not have to be used within every single http request in service. The logic behind this plugin is to only format template Strings if any was found. Otherwise it will return parsed uri without any changes.

-- convention 2 --

const requestOptions = {
  auth: {},
  headers: {},
  method: '',
  qs: {},
  uri: 'my/custom/{ authType }/path/{ pathID }',
  pathID: 'mockId123456',
}

You are able to add multiple templates into uri ('pathID',...), as long as you define their values within requestOptions.

-- convention 3 --

Format url template options can be applied on two levels:

1. When initializing plugin:

const pluginOptions = {
  valuesMap: {},
  applyToUrl: false,
};
 
httpClient.use(oniyiHttpPluginUrlTemplate(pluginOptions));

1. When configuring http request:

const requestOptions = {
  qs: {},
  uri: 'my/custom/path/without/template',
  plugins: {
    formatUrlTemplate: { // camelized plugin name
      applyToUrl: false,
    },
  },
}

Set applyToUrl to false if there is no need to apply this plugin on an uri.

Set applyToQueryString to true if formatting query string ( 'qs' ) is required.

Setup under 1. overwrites the default formatUrlTempalte options, while setup under 2. overwrites initial pluginOptions setup

const requestOptions = {
  auth: {},
  headers: {},
  qs: {
    pageSize: '{ pageSize }',
  },
  plugins: {
    formatUrlTemplate: {
      applyToQueryString: true,
    },
  },
  uri: 'my/custom/path',
  pageSize: '15',
}

-- convention 4 --

It is recommended to use this plugin in combination with oniyi-http-plugin-credentials, since it resolves authType which is being used by this plugin.

Otherwise, authType need to be added manually into requestOptions.

const requestOptions = {
  authType: 'basic',
    uri: 'my/custom/{ authType }/path',
  //...
  }

-- convention 5 --

Please provide uri parameter as a String or Url object:

const uriAsString = 'my/custom/authType }/path';
const parsedUri = {
  auth: null,
  hash: null,
  host:'host.com',
  hostname: 'host.com',
  href:'host.com/my/custom/{ authType/path',
  path:'/my/custom/path',
  pathname:'/my/custom/path',
  port: null,
  protocol:'https:',
  query: null,
  search: null,
  slashes: true,
}

If conventions 1 && 2 have not been implemented properly, response uri will look like this:

// uri as string request
{
  uri: 'my/custom/authType }/path',
}
// uri as parsed object
{
  uri: {
    auth: null,
    hash: null,
    host:'host.com',
    hostname: 'host.com',
    href:'host.com/my/custom/%7B%20authType/path',
    path:'/my/custom/%7B%20authType/path',
    pathname:'/my/custom/%7B%20authType/path',
    port: null,
    protocol:'https:',
    query: null,
    search: null,
    slashes: true,
  },
}

The reason why uriAsString response is not encoded as parsedUri is because plugin takes href prop from parsedUri, uses url.parse(href); which encodes all special characters that are used in the href path.

This way plugin is notifying service that something went wrong while setting up, most likely because of a typo.

authType can be added with falsy value as default, and in return it will be removed completely from an uri.

const requestOptions = {
  authType: '', // or 0, null, undefined, false, NaN
  uri: 'my/custom/{ authType }/path',
  //...
  };
  //...
 
const httpResponse = {
  uri: 'my/custom/path',
}

Similar goes for qs parameter, response will look like this:

{
  qs: {
    pageSize: '{ psTemplate }',
  }
}

The reason why qs response is not encoded as uri is because plugin uses url.parse(uri); which encodes all special characters that are used in the uri string.

This way it should be relatively simple injecting any parameter into service uri / qs path, in order to load the same service with different auth providers (ibm-connections-cloud, microsoft...) by using custom template mapping.