Difference between revisions of "RESTful Guide"

Latest revision as of 16:56, 26 November 2014

If you're interested in use OpenKM API we suggest to take a look at ours SDK's and take advantage of already usable libraries which connect to webservices API.

OpenKM has a complete API exposed via REST. This means you can call any of these API methods from any programming language, like Java, PHP or Python among others. This feature makes it possible to create a custom client, or integrate with third-party applications like a CRM or a CMS.

For now this API is only available since OpenKM Professional 6.2.20 and 6.4.2. This API is in development, so expect changes.

If you point your browser to http://localhost:8080/OpenKM/services, you can see the SOAP API at first place but at the bottom you will see a Available RESTful services section. These URLs are protected by BASIC authentication so you need to provide an user and password to access them.

Sample usage

To try these API methods you can use an HTTP Client library or any REST client which ease this process. Or simply you can use the curl command-line application. For example, you can list the children folders:

 $ curl -u okmAdmin:admin -H "Accept: application/json" \
   http://localhost:8080/OpenKM/services/rest/folder/getChildren?fldId=3492d662-b58e-417c-85b6-930ad0c6c3cf

The result is:

{"folders":
  {"folder":
    [
      { "author":"okmAdmin",
        "created":"2013-07-29T12:09:11+02:00",
        "path":"\/okm:root\/alfa",
        "permissions":15,
        "subscribed":false,
        "uuid":"6b3e0531-96a9-4675-bb82-215b715b20ca",
        "hasChildren":false },
      { "author":"okmAdmin",
        "created":"2013-07-24T22:56:20+02:00",
        "path":"\/okm:root\/beta",
        "permissions":15,
        "subscribed":false,
        "uuid":"41f1bace-58b4-41a9-b43e-dffc1ac9a954",
        "hasChildren":false}
    ]
  }
}

In this case you can see the result in JSON format. Otherwise you can need an XML output, which can be forced using the 'Accept header:

 $ curl -u okmAdmin:admin -H "Accept: application/xml" \
   http://localhost:8080/OpenKM/services/rest/folder/getChildren?fldId=3492d662-b58e-417c-85b6-930ad0c6c3cf

The result in XML is:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<folders>
  <folder>
    <author>okmAdmin</author>
    <created>2013-07-29T12:09:11+02:00</created>
    <path>/okm:root/alfa</path>
    <permissions>15</permissions>
    <subscribed>false</subscribed>
    <uuid>6b3e0531-96a9-4675-bb82-215b715b20ca</uuid>
    <hasChildren>false</hasChildren>
  </folder>
  <folder>
    <author>okmAdmin</author>
    <created>2013-07-24T22:56:20+02:00</created>
    <path>/okm:root/beta</path>
    <permissions>15</permissions>
    <subscribed>false</subscribed>
    <uuid>41f1bace-58b4-41a9-b43e-dffc1ac9a954</uuid>
    <hasChildren>false</hasChildren>
  </folder>
</folders>

This is a Java client for the same call:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.PasswordAuthentication;
import java.net.URL;

public class JavaRestClient {
    public static void main(String[] args) throws Exception {
        try {
            String fldUuid = "3492d662-b58e-417c-85b6-930ad0c6c3cf";
            URL url = new URL("http://localhost:8080/OpenKM/services/rest/folder/getChildren?fldId=" + fldUuid);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setRequestProperty("Accept", "application/json");
            
            Authenticator.setDefault(new Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication("okmAdmin", "admin".toCharArray());
                }
            });
            
            if (conn.getResponseCode() == 200) {
                BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
                System.out.println("Output from Server .... \n");
                String output;
                
                while ((output = br.readLine()) != null) {
                    System.out.println(output);
                }
            } else {
                System.err.println("Failed : HTTP error code : " + conn.getResponseCode());
            }
            
            conn.disconnect();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Folder

Let's create a new folder:

 $ curl -u okmAdmin:admin -H "Accept: application/json" \
   -X POST -H "Content-Type: application/json" -d '/okm:root/newfolder' \
   http://localhost:8080/OpenKM/services/rest/folder/createSimple

Document

Now we are going to create a document. For this, we need to provide the document binary data:

 $ curl -u okmAdmin:admin -H "Accept: application/json" \
   -X POST -F docPath=/okm:root/newDoc.txt -F content=@newDoc.txt \
   http://localhost:8080/OpenKM/services/rest/document/createSimple

Or also from a HTML form:

<html>
  <body>
    <form method="POST" enctype="multipart/form-data"
          action="http://localhost:8080/OpenKM/services/rest/document/createSimple">
      Select file: <input type="file" name="content" size="45"/><br/>
      Select path: <input type="text" name="docPath" value="/okm:root/newDoc.txt"/><br/>
      <input type="submit" value="Upload" />
    </form>
  </body>
</html>

And now download it:

 $ curl -u okmAdmin:admin \
   http://localhost:8080/OpenKM/services/rest/document/getContent?docId=58f79fa6-fe6e-4f68-8517-68a60898d122

Search

Search simply by content:

 $ curl -u okmAdmin:admin -H "Accept: application/json" -X GET \
   http://localhost:8080/OpenKM/services/rest/search/findByContent?content=santo+grial

Search by keyword:

 $ curl -u okmAdmin:admin -H "Accept: application/json" -X GET \
   http://localhost:8080/OpenKM/services/rest/search/findByKeywords?keyword=santo\&keyword=grial

Or use a more customized search parameters:

 $ curl -u okmAdmin:admin -H "Accept: application/json" -X GET \
   http://localhost:8080/OpenKM/services/rest/search/find?content=grial\&mimeType=application/pdf

Even can query by Property Groups:

 $ curl -u okmAdmin:admin -H "Accept: application/json" -X GET \
   http://localhost:8080/OpenKM/services/rest/search/find?content=grial\&property='okp:name=alfa'

Security

Let's see the security info associated to a given node. First show granted users:

 $ curl -u okmAdmin:admin -H "Accept: application/json" -X GET \
   http://localhost:8080/OpenKM/services/rest/auth/getGrantedUsers?nodeId=3492d662-b58e-417c-85b6-930ad0c6c3cf

And now the granted roles:

 $ curl -u okmAdmin:admin -H "Accept: application/json" -X GET \
   http://localhost:8080/OpenKM/services/rest/auth/getGrantedRoles?nodeId=3492d662-b58e-417c-85b6-930ad0c6c3cf

To grant some permissions do:

 $ curl -v -u okmAdmin:admin -X PUT -H "Content-Type: application/x-www-form-urlencoded" \
   -d user=john -d permissions=15 -d recursive=false -d nodeId=3492d662-b58e-417c-85b6-930ad0c6c3cf \
   http://localhost:8080/OpenKM/services/rest/auth/grantUser

And revoke using:

 $ curl -v -u okmAdmin:admin -X PUT -H "Content-Type: application/x-www-form-urlencoded" \
   -d user=john -d permissions=15 -d recursive=false -d nodeId=3492d662-b58e-417c-85b6-930ad0c6c3cf \
   http://localhost:8080/OpenKM/services/rest/auth/revokeUser

Property Groups

In this example we add a property group:

 $ curl -u okmAdmin:admin -H "Accept: application/json" -X PUT \
   http://localhost:8080/OpenKM/services/rest/propertyGroup/addGroup?nodeId=3492d662-b58e-417c-85b6-930ad0c6c3cf\&grpName=okg:technology

And set some property group values:

 $ curl -u okmAdmin:admin -H "Accept: application/json" \
   -X PUT -H "Content-Type: application/xml" \
   -d '<simplePropertiesGroup><simplePropertyGroup><name>okp:technology.comment</name><value>RESTful rulez!</value></simplePropertyGroup></simplePropertiesGroup>' \
   http://localhost:8080/OpenKM/services/rest/propertyGroup/setPropertiesSimple?nodeId=3492d662-b58e-417c-85b6-930ad0c6c3cf\&grpName=okg:technology

Notes

To create a note in a OpenKM folder or document you can do this (previously you need to know the node UUID):

 $ curl -u okmAdmin:admin -H "Accept: application/json" \
   -X POST -H "Content-Type: application/json" -d 'Hello, world!' \
   http://localhost:8080/OpenKM/services/rest/note/add?nodeId=3492d662-b58e-417c-85b6-930ad0c6c3cf

Conversion

Since OpenKM Professional 6.4.10 you can access the document format conversion feature from this API. For example you can convert a document from MS Office Word format to PDF:

Now we are going to create a document. For this, we need to provide the document binary data:

 $ curl -u okmAdmin:admin -F content=@sample.doc -o sample.pdf \
   http://localhost:8080/OpenKM/services/rest/conversion/doc2pdf

Or also from a HTML form:

<html>
  <body>
    <form method="POST" enctype="multipart/form-data"
          action="http://localhost:8080/OpenKM/services/rest/conversion/doc2pdf">
      Select file: <input type="file" name="content" size="45"/><br/>
      <input type="submit" value="Convert" />
    </form>
  </body>
</html>

In this sample we use this API to extract text from a document:

 $ curl -u okmAdmin:admin -F content=@sample.doc http://localhost:8080/OpenKM/services/rest/conversion/doc2txt

You can also make use of the integrated OCR engine. For example:

 $ curl -u okmAdmin:admin -F content=@sample.tif http://localhost:8080/OpenKM/services/rest/conversion/img2txt

More info at:

• curl tutorial with examples of usage