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Implementation of the new REST
API for Open Source LBS-platform
Geo2Tag
Mark Zaslavskiy, ITMO University, Fruct Ltd.
Dmitry Mouromtsev, ITMO University.
1
Introduction and initial state
• Geo2Tag is an OpenSource LBS-platform – open
backend for geo- and geocontext services.
• Existing sources are written in C++ with
PostgreSql as a data storage.
• Platform development is performed using
crowdsourcing model:
▫ Students of various IT departments do most of the
work.
▫ Professional developers provide process control.
2
Challenges
•Encourage usage of the platform
by 3rd party developers.
•Simplify existing sources for
better understanding by students.
3
Solution
• Solution:
▫ Rewrite API and backend to be more understandable and
maintainable.
▫ Add instruments for platform customization and data import.
• Tasks
▫ Change API to be more RESTful:
 Resource-based API URLs;
 Support of paginated requests;
 Data visualization;
 OAuth authorization;
 Plugin system ( = background data processing).
▫ Change backend to Python, due to portability and easier support.
▫ Change data storage to MongoDb due to built-in georequests and
flexible collection structure.
4
Use case
5
Db structure
• MasterDb:
▫ metadata,
▫ service data,
▫ users,
▫ instance logs.
• Service db:
▫ channels,
▫ points,
▫ service logs.
6
REST API
• resource-based urls
• pagination support – all queries which produce lists
where extended with number and offset
parameters
• all platform entities (services, points, channels,
users, plugins) where made identifiable
• examples:
▫ curl -b 'cookiefile.cookie' -X GET
'http://geomongo/instance/service/testservice/c
hannel?number=10&offset=0‘
▫ curl -b 'cookiefile.cookie' -X DELETE
'http://geomongo/instance/service/SERVICE_N
AME'
7
OAuth2 authorization support
• Old API was trying to perform full stack of user
registration and it cause a lot of actions must be
done by instance administrator.
• Solution:
▫ Only OAuth2 authorization.
▫ During the authorization user account is created
in case of first login and identifier is stored in an
encrypted cookie.
▫ Google and Facebook as OAuth providers with
ability of fast addition of other providers.
8
Data visualization
9
Data visualization
10
Plugins
• Plugin is an extension for Geo2Tag REST
API isolated inside /<prefix>/plugins/
resource.
• Plugins are deployed as pep8-comparable
python packages which match Geo2Tag
interfaces.
• Plugins are installed by instance
administrator.
11
OpenData import
• Goal: demonstrate how Geo2Tag plugins can be used
and add ability to high level import of data into the
platform.
• Solution: built-in general interfaces for OpenData
import plugin development:
▫ Data acquiring/parsing/importing classes.
▫ Interfaces for keeping references between
imported data and sources.
▫ Import versioning interfaces.
▫ Wrapper around Geonames geocoder for Open
Data without geographical coordinates.
12
OpenKarelia import plugin
• Import of digital museum objects from
OpenKarelia information system
http://openkarelia.org/
• Plugin retrieves name, image, brief
description, date information.
• Interval dates are converted from
OpenKarelia format to Geo2Tag format.
13
Conclusions
• New API and backend with support of
user-defined plugins.
• For encouraging 3rd party developers
OpenData import API was added
• Future plans
▫ Web UI for administration.
▫ API for high level management of imported
data.
14
Contacts
• Mark Zaslavskiy, mark.zaslavskiy@fruct.org
• Project resources: http://test.geo2tag.org/,
http://geo2tag.atlassian.net/
• Demo server http://demo.geo2tag.org/
15

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Implementation of the new REST API for Open Source LBS-platform Geo2Tag

  • 1. Implementation of the new REST API for Open Source LBS-platform Geo2Tag Mark Zaslavskiy, ITMO University, Fruct Ltd. Dmitry Mouromtsev, ITMO University. 1
  • 2. Introduction and initial state • Geo2Tag is an OpenSource LBS-platform – open backend for geo- and geocontext services. • Existing sources are written in C++ with PostgreSql as a data storage. • Platform development is performed using crowdsourcing model: ▫ Students of various IT departments do most of the work. ▫ Professional developers provide process control. 2
  • 3. Challenges •Encourage usage of the platform by 3rd party developers. •Simplify existing sources for better understanding by students. 3
  • 4. Solution • Solution: ▫ Rewrite API and backend to be more understandable and maintainable. ▫ Add instruments for platform customization and data import. • Tasks ▫ Change API to be more RESTful:  Resource-based API URLs;  Support of paginated requests;  Data visualization;  OAuth authorization;  Plugin system ( = background data processing). ▫ Change backend to Python, due to portability and easier support. ▫ Change data storage to MongoDb due to built-in georequests and flexible collection structure. 4
  • 6. Db structure • MasterDb: ▫ metadata, ▫ service data, ▫ users, ▫ instance logs. • Service db: ▫ channels, ▫ points, ▫ service logs. 6
  • 7. REST API • resource-based urls • pagination support – all queries which produce lists where extended with number and offset parameters • all platform entities (services, points, channels, users, plugins) where made identifiable • examples: ▫ curl -b 'cookiefile.cookie' -X GET 'http://geomongo/instance/service/testservice/c hannel?number=10&offset=0‘ ▫ curl -b 'cookiefile.cookie' -X DELETE 'http://geomongo/instance/service/SERVICE_N AME' 7
  • 8. OAuth2 authorization support • Old API was trying to perform full stack of user registration and it cause a lot of actions must be done by instance administrator. • Solution: ▫ Only OAuth2 authorization. ▫ During the authorization user account is created in case of first login and identifier is stored in an encrypted cookie. ▫ Google and Facebook as OAuth providers with ability of fast addition of other providers. 8
  • 11. Plugins • Plugin is an extension for Geo2Tag REST API isolated inside /<prefix>/plugins/ resource. • Plugins are deployed as pep8-comparable python packages which match Geo2Tag interfaces. • Plugins are installed by instance administrator. 11
  • 12. OpenData import • Goal: demonstrate how Geo2Tag plugins can be used and add ability to high level import of data into the platform. • Solution: built-in general interfaces for OpenData import plugin development: ▫ Data acquiring/parsing/importing classes. ▫ Interfaces for keeping references between imported data and sources. ▫ Import versioning interfaces. ▫ Wrapper around Geonames geocoder for Open Data without geographical coordinates. 12
  • 13. OpenKarelia import plugin • Import of digital museum objects from OpenKarelia information system http://openkarelia.org/ • Plugin retrieves name, image, brief description, date information. • Interval dates are converted from OpenKarelia format to Geo2Tag format. 13
  • 14. Conclusions • New API and backend with support of user-defined plugins. • For encouraging 3rd party developers OpenData import API was added • Future plans ▫ Web UI for administration. ▫ API for high level management of imported data. 14
  • 15. Contacts • Mark Zaslavskiy, mark.zaslavskiy@fruct.org • Project resources: http://test.geo2tag.org/, http://geo2tag.atlassian.net/ • Demo server http://demo.geo2tag.org/ 15