File-Store-Service

Owned by Ghanshyam Rawat
Last updated: Jul 16, 2020 by Kaviyarasan P
3 min read

INTRODUCTION


An eGov core application which handles uploading different kinds of files to server including images and different document types.


Requirements:


  1. Prior Knowledge of Java/J2EE.
  2. Prior Knowledge of Spring Boot.
  3. Prior Knowledge of REST APIs and related concepts like path parameters, headers, JSON etc.
  4. Prior knowledge of aws and azure


Functionality: 

The filestore application takes in a request object which contains an image/document or any kind of file and stores them in a disk/AWS/azure depending upon the configurations, additional implementations can be written for the app interface to interact with any other remote storages.


The request file to be uploaded is taken in form of multipart file part then saved to the storage and a uuid will returned as a unique identifier for that resource, which can be used to fetch the documents later.


Incase of images, the application will create three more additional copies of the file in the likes of large, medium and small for the usage of thumbnails or low quality images incase of mobile applications.


The search api takes the uuid, tenantid as mandatory url params and a few optional parameters and returns the presigned url of the files from the server, In case of images a single string containing multiple urls separated by commas will be returned representing different sizes of images stored.


Feature List: 


  1. Upload
    POST API to save the files in the server

  2. Search Files
     GET API to retrieve file based only on id and tenantid

  3. Search URLs 
    GET API  to retrieve pre-signed urls for given array of ids

FLOW DIAGRAM 

SETUP AND USAGE:

The Application is present among the core group of applications available in the eGov-services git repository.  The spring boot application but needs lombok extension added in your ide to load it. Once the application is up and running API requests can be posted to the url and ids can be generated. 


**in case of intellij the plugin can be installed directly, for eclipse the lombok jar location has to be added in eclipse.ini file in this format -javaagent:lombok.jar.


For the API information please refer the swagger yaml 


GOTO : https://editor.swagger.io/  and click on file -> import url 


Then add the raw url of the API doc in the pop up. 


---> add url here 


Incase the url is unavailable, please go to the docs folder of egov-services git repo and find the yaml for egov-filestroe.



The application needs at least one type of storage available for it to store the files either file-storage, AWS S3 or azure. More storage types can be added by extending the application interface also.


To work work any of the file storages there are some application properties which needs to be configured.


DiskStorage:

The mount path of the disk should be provided in the following variable to save files in the disc. file.storage.mount.path=path.


Following are the variables that needs to be populated based on the aws/azure account you are integrating with.


How to enable Minio SDC:

minio.url=http://minio.backbone:9000(Minio server end point)

isS3Enabled=true(Should be true)

aws.secretkey={minio_secretkey}

aws.key={minio_accesskey}

fixed.bucketname=egov-rainmaker(Minio bucket name)

minio.source=minio


How to enable AWS S3:

minio.url=https://s3.amazonaws.com

isS3Enabled=true(Should be true)

aws.secretkey={s3_secretkey}

aws.key={s3_accesskey}

fixed.bucketname=egov-rainmaker(S3 bucket name)

minio.source=minio


AZURE:

isAzureStorageEnabled - informing the application whether Azure is available or not

azure.defaultEndpointsProtocol - type of protocol https

azure.accountName - name of the user account 

azure.accountKey - secret key of the user account


NFS :

isnfsstorageenabled-informing the application whether NFS is available or not <True/False>

file.storage.mount.path - <NFS location, example /filestore>

source.disk -  diskStorage - name of storage

disk.storage.host.url=<Main Domain URL>


Allowed formats to be uploaded: 


# the default format of the allowed file formats goes in a set bracket with string inside it - {"jpg","png"} - please follow the same.

allowed.formats.map={jpg:{'image/jpg','image/jpeg'},jpeg:{'image/jpeg','image/jpg'},png:{'image/png'},pdf:{'application/pdf'},odt:{'application/vnd.oasis.opendocument.text'},ods:{'application/vnd.oasis.opendocument.spreadsheet'},docx:{'application/x-tika-msoffice','application/x-tika-ooxml','application/vnd.oasis.opendocument.text'},doc:{'application/x-tika-msoffice','application/x-tika-ooxml','application/vnd.oasis.opendocument.text'},dxf:{'text/plain'},csv:{'text/plain'},txt:{'text/plain'},xlsx:{'application/x-tika-ooxml','application/x-tika-msoffice'},xls:{'application/x-tika-ooxml','application/x-tika-msoffice'}}

The key in the map is the visible extension of the file types, the values on the right in curly braces are the respective tika types of the file. these values can be found in tika website or by passing the file through tika functions.




ACCESS:

Please use the postman collection to access apis of the filestore services

 - https://www.getpostman.com/collections/1b448834735adf1acc4a