Watermark

Tech

This example uses a number of open source projects to work properly:

Scalatra - web and restful framework
Slick - data persistence
h2 - embedded database
Akka - async message dispatcher
itextpdf - PDF manipulation

Data Model

There is only one table named "Documents"

Column	Type	default	nullable
id	Int
content	enum(book, journal)
title	String
author	String
topic	enum(business, science, media)		true
status	enum(initial, pending, done, error)	initial
ticket	String
fileName	String		true
message	String		true

Service APIs

Method	Endpoint	Status Code	Short Description
GET	/documents	200	return a list all of documents metadata.
GET	/documents/:ticket	200	return a document metadata by ticket, it can be used to check status.
		404	document metadata not found by ticket
GET	/documents/:ticket/watermarkedfile	200	find a document meta by ticket and return the document pdf rendered with text watermark.
		404	document metadata not found or watermarked pdf not found by ticket
POST	/documents	200	create new document metadata, the payload contains content, title, author, and topic(it is required for book content), and return the document metadata, you can find ticket out.
		400	bad request
POST	/documents/:ticket/file	202	upload a pdf for the specified document meatdata, the payload is multipart/form-data including only one fieldItem named "file". the file will be processed if it is accepted
		406	if the file to upload is unacceptable, e.g. it is not a pdf
		400	bad request

Build & Run

$ cd Watermark
$ ./sbt
> jetty:start
> browse

If browse doesn't launch your browser, manually open http://localhost:8080/ in your browser.

Test

$ cd Watermark
$ ./sbt test

curl Samples

Create document metadata

curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
	"content":"book",
	"title":"Code Complete",
	"author": "Steve McConnell",
	"topic":"science"
}' "http://localhost:8080/documents"

Upload original pdf

curl -F "file=@/Users/pqian/Documents/test.pdf" "http://localhost:8080/documents/e86f2885-33b5-4afd-b78d-4324f44f3f76/file"