How to use "POST url" JSON file in RoR website? - ruby-on-rails-3

Question

I am using Ruby on Rails and Kibana to show visualisation in my website(Ruby2.6.0, Rails5.2.3, Kibana6.6.1). By using Xpack->Share->Generate PDF/PNG, I find 'copy POST url'. I can get the following JSON file from the POST url by using 'net/http', but how can I use POST url/JSON file in my RoR website to download PNG file in 'assets' folder?
JSON file I got from POST url:
{'path': '/api/reporting/jobs/download/jvds4zs10qv79d0062b9cel6',
'job': {'id': 'jvds4zs10qv79d0062b9cel6', 'index':
'.reporting-2019.05.05', 'type': 'esqueue', 'jobtype': 'PNG',
'created_by': False, 'payload': {'type': 'visualization', 'title':
'[eCommerce] Sales by Gender', 'relativeUrl':
"/app/kibana#/visualize/edit/ed8436b0-b88b-11e8-a6d9-e546fe2bba5f?_g=(refreshInterval:(pause:!t,value:0),time:(from:now-60d,mode:quick,to:now))&_a=(filters:!(),linked:!f,query:(language:lucene,query:''),uiState:(),vis:(aggs:!((enabled:!t,id:'1',params:(),schema:metric,type:count),(enabled:!t,id:'2',params:(field:customer_gender,json:'',missingBucket:!f,missingBucketLabel:Missing,order:desc,orderBy:'1',otherBucket:!f,otherBucketLabel:Other,size:5),schema:segment,type:terms)),params:(addLegend:!t,addTooltip:!t,isDonut:!t,labels:(last_level:!t,show:!t,truncate:100,values:!t),legendPosition:right,type:pie),title:'%5BeCommerce%5D+Sales+by+Gender',type:pie))",
'headers':
'uxY4w6gCRwwLZyFkDX0ujVlANYq7ae5UuNJAN0GpbTOX7vw5aPuCuyr37nNcpz3vtA8kNVaL6Gacs24mPjZfwl4mB9xRKGA62CkCLo8Xz1amuIEthI+BtKPGo5QAk2k2+7zLvLgX3KouVvYdd61U5rLAvfjv4TydcpH9qJ4qrL5OELkzAJGrNdujtDLWaoy2Qj9YXbLnh7gSdI+lrNml6usZIh4pMzz8qdRo597iO/4AeSJRa2JfAruyGB3zYInZRtMuCbA4f3ANvT2WeAn6lpiwThB993uEjwu4LBVUZuo2XL0TcB29YNNa9oMCUEhWjdJ1ase5VQdz8V2IOgecQ1W52V5JuVTvl9SkVvFWSBhXJg==',
'browserTimezone': 'Europe/Zurich', 'layout': {'dimensions':
{'height': 589.234375, 'width': 866}}, 'basePath': '', 'forceNow':
'2019-05-07T12:38:12.768Z'}, 'timeout': 120000, 'max_attempts': 3,
'priority': 10, 'browser_type': 'chromium'}}
I am trying to use 'net/http', What I added in controller:
class MaisonController < ApplicationController
require 'net/http'
def require_post
uri = URI.parse("http://localhost:5601/api/reporting/generate/png?jobParams=(browserTimezone:Europe%2FZurich,layout:(dimensions:(height:589.234375,width:866)),objectType:visualization,relativeUrl:%27%2Fapp%2Fkibana%23%2Fvisualize%2Fedit%2Fed8436b0-b88b-11e8-a6d9-e546fe2bba5f%3F_g%3D(refreshInterval:(pause:!!t,value:0),time:(from:now-60d,mode:quick,to:now))%26_a%3D(filters:!!(),linked:!!f,query:(language:lucene,query:!%27!%27),uiState:(),vis:(aggs:!!((enabled:!!t,id:!%271!%27,params:(),schema:metric,type:count),(enabled:!!t,id:!%272!%27,params:(field:customer_gender,json:!%27!%27,missingBucket:!!f,missingBucketLabel:Missing,order:desc,orderBy:!%271!%27,otherBucket:!!f,otherBucketLabel:Other,size:5),schema:segment,type:terms)),params:(addLegend:!!t,addTooltip:!!t,isDonut:!!t,labels:(last_level:!!t,show:!!t,truncate:100,values:!!t),legendPosition:right,type:pie),title:!%27%255BeCommerce%255D%2BSales%2Bby%2BGender!%27,type:pie))%27,title:%27%5BeCommerce%5D%20Sales%20by%20Gender%27)")
http = Net::HTTP.new(uri.host,uri.port)
request = Net::HTTP::Post.new(uri.request_uri)
response = http.request(request)
render :json => response.body
end
end
Edit:
I try to use 'attachment_fu' gem to download png file with the above JSON file. Modify the code in Controller to the following code:
class MaisonController < ApplicationController
require 'net/http'
require 'open-uri'
def require_post
uri = URI.parse("http://localhost:5601/api/reporting/generate/png?jobParams=(browserTimezone:Europe%2FZurich,layout:(dimensions:(height:589.234375,width:866)),objectType:visualization,relativeUrl:%27%2Fapp%2Fkibana%23%2Fvisualize%2Fedit%2Fed8436b0-b88b-11e8-a6d9-e546fe2bba5f%3F_g%3D(refreshInterval:(pause:!!t,value:0),time:(from:now-60d,mode:quick,to:now))%26_a%3D(filters:!!(),linked:!!f,query:(language:lucene,query:!%27!%27),uiState:(),vis:(aggs:!!((enabled:!!t,id:!%271!%27,params:(),schema:metric,type:count),(enabled:!!t,id:!%272!%27,params:(field:customer_gender,json:!%27!%27,missingBucket:!!f,missingBucketLabel:Missing,order:desc,orderBy:!%271!%27,otherBucket:!!f,otherBucketLabel:Other,size:5),schema:segment,type:terms)),params:(addLegend:!!t,addTooltip:!!t,isDonut:!!t,labels:(last_level:!!t,show:!!t,truncate:100,values:!!t),legendPosition:right,type:pie),title:!%27%255BeCommerce%255D%2BSales%2Bby%2BGender!%27,type:pie))%27,title:%27%5BeCommerce%5D%20Sales%20by%20Gender%27)")
http = Net::HTTP.new(uri.host,uri.port)
request = Net::HTTP::Post.new(uri.request_uri)
response = http.request(request)
render :json => response.body
http.start() { |http|
tempfile = Tempfile.new('test.png')
File.open(tempfile.path, 'w') do |f|
f.write response.body
end
attachment = Attachment.new(:upload_data => LocalFile.new(tempfile.path))
attachment.save
}
end
The error I get is 'uninitialized constant MaisonController::Attachment'.
Expected result: download png file in assets by using the above JSON file.

Answer 1

I will answer my own question about what I tried in my project and close this question.
I got 'copy POST url' in 'Kibana->Visualisation/Dashboard->PDF/PNG'. It is a post url. I sent post request with this url to kibana server. The action will trigger kibana server to 'pending', 'processing' and generate the report. And I will get a JSON file back from the server. There is an important job ID in JSON file, like this 'jvi53ajd21w09d006233kcvo'. I can find all history reports in 'Management->Reporting'. Finally, I use the generated url 'http://localhost:5601/api/reporting/jobs/download/jvi53ajd21w09d006233kcvo' with 'wget' command to download the report in my local folder.
You can find similar answer here: https://discuss.elastic.co/t/how-to-use-post-url-to-share-visualisation-in-my-website/179671/4
Hope my answer can help those who want to use POST URL in Kibana.