pinterest / api-quickstart

Code that makes it easy to get started with the Pinterest API.

pinterest/api-quickstart

Code that makes it easy to get started with the Pinterest API.

Purpose

This repository has code that is intended to provide a quick start for working with the Pinterest API v5. There is currently python code that implements a number of use cases, JavaScript (nodejs) code with essentially the same functionality, a bash script that demonstrates the OAuth authentication and authorization flow, and an example application in PHP.

This quickstart used to support Pinterest API version v3 and v4, but that code has been removed so that everyone can focus on v5. If you're interested in code that shows the differences between using v3/v4 and v5, see version 1.1 of this repo.

Quick Start

1. Set up the environment with your credentials (app ID and secret). This configuration works with the code in all of the language-specific directories.

   • Get an application ID and secret by hitting the "Connect app" button at https://developers.pinterest.com/apps/. You may first need to follow the steps required to request trial access to the Pinterest API. You can also find step-by-step instructions on the Glitch-based tutorial.
   • Once your app is connected, hit the Manage button for the app on https://developers.pinterest.com/apps/ to see your App id and App secret key. (Click the Show key button to see the App secret key.)
   • Put your App ID and App secret key in an environment script file.

     $ cd common/scripts
     $ cp api_app_credentials.template api_app_credentials
     # edit api_app_credentials and enter your app id and secret in the specified locations
     $ cd ../..
     

   • Configure the OAuth2 redirect URI required by this code.
     1. Click on the Manage button for your application at https://developers.pinterest.com/apps/.
     2. In the box labeled "Redirect link," enter http://localhost:8085/.
     3. Hit the return (enter) key or the Add button to save redirect URI (link).
   • Run the environment set-up script and verify the results.

     $ . ./common/scripts/api_env
     $ env | grep PINTEREST_APP
     PINTEREST_APP_ID=<number>
     PINTEREST_APP_SECRET=<string>
     

2. Pick one of the language directories (currently bash, nodejs, php, and python) and follow the directions in the README file in the directory:

   • NodeJS README

     cd ./nodejs
     

   • Python README

     cd ./python
     

   • Bash README

     cd ./bash
     

   • PHP README

     cd ./php
     

OAuth 2.0 Authorization

Access to Pinterest APIs via User Authorization requires following a flow based on OAuth 2.0. To learn about how to use OAuth 2.0 with the Pinterest API, check out the Glitch-based tutorial. For details regarding OAuth, please refer to our v5 developer docs. The code in this repo demonstrates how to initiate the flow by starting a browser, and then handling the OAuth redirect to the development machine (localhost). The browser is used to obtain an authorization code, and then the code invoked by the redirect exchanges the authorization code for an access token.

An access token is used to authenticate most API calls. In general, access tokens are valid for relatively long periods of time, in order to avoid asking users to go through the OAuth flow too often. When an access token expires, it is possible to refresh the token -- a capability that the code in this repo also demonstrates.

Like users, most developers do not want to have to go through the OAuth flow too often. So, the python code supports (and soon, other languages will support) two methods for storing OAuth access token:

• Storing the access token to a JSON-encoded file. The default path in this repo for storing access tokens is common/oauth_tokens/access_token.json. To generate this file, use the language-specific get_access_token script with the -w argument. You can also use the -a argument to specify the name of the token, which is the same as the name of the JSON file. For example, set up the python environment and then run python/scripts/get_access_token.py -w -a my_access_token -s READ_USERS. The contents of this file can be as simple as this JSON: {"access_token": "<access token retrieved from OAuth flow>"}. The complete set of JSON object keys are:
  • access_token: The access token returned by the OAuth flow. [required]
  • name: A textual description of the access token. (e.g. "API test account #2")
  • refresh_token: The refresh token returned by the OAuth flow.
  • scopes: The OAuth scopes associated with the token
• Storing the access token in an environment variable. The default environment variable is simply ACCESS_TOKEN, so running the command export ACCESS_TOKEN=<access_token_retrieved_via_oauth> will work in most situations. This method for specifying an access token is intended to be the easiest, fastest way to use an externally-generated access token with the code in this repo.

The precedence order in this repo for obtaining an access token is: environment, file, execute the OAuth 2.0 flow.

Code that implements OAuth is available for each language in this repo. The location of the code is as follows.

• A bash script that provides a complete example: bash/scripts/get_access_token.sh.
• In python, the code in python/src/user_auth.py opens a browser and handles the redirect to obtain an authorization code. The code to exchange the authorization code for an access token is in python/src/access_token.py. This file also implements access token refresh.
• In JavaScript, the code in nodejs/src/user_auth.js opens a browser and handles the redirect to obtain an authorization code. The code to exchange the authorization code for an access token is in nodejs/src/access_token.js. This file also implements access token refresh.
• In PHP, the code in php/index.php provides a complete example.

Security Notes

• Best development practice is to keep authentication credentials (like your app secret and OAuth access tokens) out of code.
• When using a JSON-encoded file to specify an access token, use a secure file mode when possible. For example: chmod 600 common/oauth_tokens/*
• When specifying credentials in environment variables, export it from a script file instead of on the shell command line. (Commands -- along with the clear text credentials -- are often stored in history and log files.)
• The recommended locations for your credentials (common/scripts/api_app_credentials), and access tokens (common/oauth_tokens) are listed in the .gitignore file to help avoid checking this material into a git repo.
• Specifying a high level of logging verbosity may print credentials in clear text. This data is useful for local debugging, but should be protected -- not transmitted via email or other insecure kinds of communication.

Repository Layout

• The common directory stores code and files that work with all of the language-specific directories.
• Each language-specific directory is independent of the others:
  • bash: shell scripts
  • nodejs: JavaScript code and demonstration scripts intended to be run with Node.js
  • php: PHP example application
  • python: structured python code and demonstration scripts. Since the python code is implemented first, python typically has the most functionality.
• Each language-specific directory (e.g. python or bash) may have one or more of these subdirectories:
  • scripts are executable files that demonstrate one or more use cases.
  • src contains code that is used by the scripts and that you can incorporate into your own applications.
  • tests contains unit and integration tests.

Code Conventions

The README file in each language-specific directory provides details for the code conventions for the associated programming language.

All shell scripts in this respository are written for bash and are linted with ShellCheck.

Other Resources

• Pinterest Developers
• Pinterest OAuth 2.0 Tutorial
• Pinterest Engineering Blog
• The pinterest/api-description repo on GitHub contains OpenAPI descriptions for Pinterest's REST API.