Note: Since @oznome has discontinued maintenance of pidsvc-docker, work on this service as well as associated automation tools has been moved to https://github.com/internetofwater/IoW-PIDsvc

Persistent Identifier Service (PID Service)

This is a deployment system using docker for the PIDsvc developed by CSIRO. https://www.seegrid.csiro.au/wiki/Siss/PIDService#Prerequisites

1. Overview
2. Deployment
3. API Request Templates

• Batch import
• Delete individual mapping

Overview

The Persistent Identifier Service (PID Service) enables resolution of persistent identifiers. All incoming HTTP requests are intercepted by an Apache HTTP web server level and passed to a dispatcher servlet that matches a pattern of an incoming request and compares it with the patterns configured in the PID Service and stored in a persistent relational data store (e.g. PostgreSQL) and then performs a set of user-defined actions, such as, HTTP header manipulation, redirects, proxying requests, delegating resolution to another service, etc. It features extendable architecture for future improvements and supports multiple control interfaces - visual user interface (UI) as well as programmable API for remote user-less management of URI mapping rules.

Implementation has taken into account findings, requirements and observations discovered during technology review and prototype implementation phases that immediately preceded implementation of the PID Service: https://www.seegrid.csiro.au/wiki/bin/view/SISS4BoM/PIDTechnologyReview https://www.seegrid.csiro.au/wiki/bin/view/SISS4BoM/PIDPrototypeSolution

This docker configuration includes 3 images: a postgres database, tomcat (with a pidsvc .war for the dispatcher, API, and user interface) and apache2 as a request interceptor and load balancer. It is designed to easily allow deployment of the PIDsvc, including with load balancing for greater scalability. Scaled to 5 replicas, it has been tested to drop less than 20 of 1,000,000 requests made over 160 minutes (~1000/s).

Deployment

This assumes a machine running Ubuntu 18.04 LTS with at least 10GB of disk space and 1.5GB of RAM

1. Install Docker
2. Install Docker-Compose
3. git clone [] to your Server (ubuntu 18.04 LTS)
4. create directory /srv/pid/data/PIDsvc for backup of database
5. docker-compose build
6. docker-compose up --scale tomcat3=5 One can set tomcat3=n, where n is number of pidsvc instances desired for apache to load balance to over docker internal round-robin DNS
7. Pidsvc is deployed at http://localhost:8095

Accessing the web GUI for managing and implementing redirects

Current test deployment is at https://geoconnex.us/pidsvc

Optional: Enable https

The most straightforward way to serve the PID service over https is to set up a reverse proxy that routes all https traffic coming through port 443 to the "backend service" running on the tomcat docker image on port 8095, and redirects all http traffic coming through port 80 to port 443. The simplest way to do this is with the Caddy server, which by default provisions and renews free SSL certificates from letsencrypt.org.

Caddy can be built from source using the Go language.

1. Install Go
2. git clone -b v2 "https://github.com/caddyserver/caddy.git"
3. cd caddy/cmd/caddy/
4. go build

Installing and configuring Caddy is simple once built

5. Manual Install caddy server for Linux
6. caddy reverse-proxy --from example.com --to localhost.IP.address:8095

Optional: Security

1. BasicAuth implemented on virtual host, with password hashes stored on server. When BasicAuth is enabled, the GUI import/restore feature does not work. Long term, this either needs to be fixed or in production all batch mappings need to be done through the API by an authorized user/ machine.

• Password hashes to be stored in this configuration in /apache/.htpasswd
• In apache/httpd-vhosts.conf, the allowed users need to be added to the Require user directive

API Request Templates

Batch import via xml file

Import an xml file of 1:1 mappings located at path/<import-file.xml>. Note, any mappings for paths already registered will be overwritten by default.

Using shell/ curl

curl --user [name]:[password] https://geoconnex.us/pidsvc/controller?cmd=import -X POST -F "source=@<path>/import-file.xml" -H "Content-Type: multipart/mixed" 

Using R

library(httr)

# URL of API endpoint + command
api <- "https://geoconnex.us/pidsvc/controller?cmd=import"

# set path to xml code desired
payload <- list(y = upload_file("<path>/import-file.xml", type = "text/xml"))

# POST with authentication and appropriate header
x <- POST(api, body = payload, authenticate("user", "password"), add_headers("Content-Type" = "multipart/mixed"))

Using Python

import requests

#URL of API endpoint + command
api = 'https://geoconnex.us/pidsvc/controller?cmd=import'

#POST the file with authentication
with open('<path>/import-file.xml') as f:
    r = requests.post(api, files={'<path>/import-file.xml': f}, auth=('user','password'))

Delete individual mapping

Delete a mapping for /namespace/path/endofpath. Note that this does not actually delete the mapping but deprecates and inactivates it. Full version histories are kept in the persistent data store.

Using shell/ curl

curl --user [name]:[password] https://geoconnex.us/pidsvc/controller?cmd=delete_mapping -d "mapping_path=/namespace/path/endofpath" -X POST

Using R

library(httr)

# URL of API endpoint + command
api <- "https://geoconnex.us/pidsvc/controller?cmd=delete_mapping"

# specify the individual path to be deleted
payload <- list(mapping_path = "/namespace/path/endofpath")

# POST with authentication
x <- POST(api, body = payload, authenticate("user", "password"), encode = "form")

Using Python

import requests

#URL of API endpoint + command
api ='https://geoconnex.us/pidsvc/controller?cmd=delete_mapping'

#specify the individual path to be deleted
payload = {'mapping_path':'/namespace/path/endofpath'}

#POST with authentication
r = requests.post(api, data = payload, auth=('user','password'))