From 42f8e6b7f2ac0a1ebe08340f32b578d0c6c84a8b Mon Sep 17 00:00:00 2001
From: Jimmy Bosse <jimmy.bosse@ankura.com>
Date: Mon, 23 Jan 2023 11:57:37 -0500
Subject: [PATCH 1/4] Implement OCR

---
 .vscode/extensions.json                       |   7 ++
 .vscode/settings.json                         |  13 +++
 README.md                                     |   4 +-
 lib/pdfservices.rb                            |   6 +
 lib/pdfservices/ocr/operation.rb              | 104 ++++++++++++++++++
 lib/pdfservices/ocr/result.rb                 |  24 ++++
 lib/pdfservices/version.rb                    |   2 +-
 test/fixtures/files/fake_ocr_done.pdf         | Bin 0 -> 23 bytes
 test/fixtures/files/not_yet_ocr.pdf           | Bin 0 -> 21530 bytes
 test/fixtures/ocr_done.json                   |   3 +
 test/fixtures/ocr_in_progress.json            |   7 ++
 .../presigned_upload_url_response.json        |   4 +
 test/integration_spikes/ocr.rb                |  19 ++++
 ..._integration.rb => test_document_merge.rb} |   2 +-
 test/pdf_services_sdk/test_ocr.rb             |  88 +++++++++++++++
 15 files changed, 280 insertions(+), 3 deletions(-)
 create mode 100644 .vscode/extensions.json
 create mode 100644 .vscode/settings.json
 create mode 100644 lib/pdfservices/ocr/operation.rb
 create mode 100644 lib/pdfservices/ocr/result.rb
 create mode 100644 test/fixtures/files/fake_ocr_done.pdf
 create mode 100644 test/fixtures/files/not_yet_ocr.pdf
 create mode 100644 test/fixtures/ocr_done.json
 create mode 100644 test/fixtures/ocr_in_progress.json
 create mode 100644 test/fixtures/presigned_upload_url_response.json
 create mode 100644 test/integration_spikes/ocr.rb
 rename test/pdf_services_sdk/{test_integration.rb => test_document_merge.rb} (97%)
 create mode 100644 test/pdf_services_sdk/test_ocr.rb

diff --git a/.vscode/extensions.json b/.vscode/extensions.json
new file mode 100644
index 0000000..6b0e261
--- /dev/null
+++ b/.vscode/extensions.json
@@ -0,0 +1,7 @@
+{
+  "recommendations": [
+    "rebornix.ruby",
+    "oderwat.indent-rainbow",
+    "ms-vsliveshare.vsliveshare"
+  ]
+}
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..e1a29cc
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,13 @@
+{
+  "editor.rulers": [
+    100,
+    120
+  ],
+  "files.exclude": {
+    "**/.git": true,
+    "**/.svn": true,
+    "**/.hg": true,
+    "**/.DS_Store": true,
+    "**/tmp": true
+  }
+}
diff --git a/README.md b/README.md
index 734030e..7204c3b 100644
--- a/README.md
+++ b/README.md
@@ -34,8 +34,10 @@ Then you need to create a json file with your credentials:
 }
 
 ```
+### Supported API calls:
 
-Right now the only supported API is document merge. See `test/pdf_services_sdk/test_integration.rb` for an example usage.
+- Document merge. See `test/pdf_services_sdk/test_integration.rb` for an example usage.
+- OCR. See `test/pdf_services_sdk/test_ocr.rb` for an example usage.
 
 ## Development
 
diff --git a/lib/pdfservices.rb b/lib/pdfservices.rb
index b27e867..c162abe 100644
--- a/lib/pdfservices.rb
+++ b/lib/pdfservices.rb
@@ -5,6 +5,7 @@
 require "jwt"
 require "multipart_parser/reader"
 require "yaml"
+require "pdfservices/version"
 
 module PdfServices
   autoload :CredentialsBuilder, "pdfservices/credentials_builder"
@@ -15,4 +16,9 @@ module DocumentMerge
     autoload :Operation, "pdfservices/document_merge/operation"
     autoload :Result, "pdfservices/document_merge/result"
   end
+
+  module Ocr
+    autoload :Operation, "pdfservices/ocr/operation"
+    autoload :Result, "pdfservices/ocr/result"
+  end
 end
diff --git a/lib/pdfservices/ocr/operation.rb b/lib/pdfservices/ocr/operation.rb
new file mode 100644
index 0000000..c1561f1
--- /dev/null
+++ b/lib/pdfservices/ocr/operation.rb
@@ -0,0 +1,104 @@
+# frozen_string_literal: true
+
+require "http"
+require "pdfservices/jwt_provider"
+require "pdfservices/ocr/result"
+require "yaml"
+
+module PdfServices
+  module Ocr
+    class Operation
+      PRESIGNED_URL_ENDPOINT = "https://pdf-services.adobe.io/assets"
+      OCR_ENDPOINT = "https://pdf-services.adobe.io/operation/ocr"
+      ASSETS_ENDPOINT = "https://pdf-services.adobe.io/assets"
+
+      def initialize(credentials = nil)
+        @credentials = credentials
+      end
+
+      def get_presigned_url
+        response = api.post(PRESIGNED_URL_ENDPOINT, json: { mediaType: "application/pdf" })
+        if response.status == 200
+          JSON.parse(response.body.to_s)
+        else
+          Result.new(nil, "Unexpected response status from get presigned url: #{response.status}")
+        end
+      end
+
+      def upload_asset(source_pdf)
+        presigned_url = get_presigned_url()
+        upload_uri = presigned_url["uploadUri"]
+        asset_id = presigned_url["assetID"]
+        aws = HTTP.headers({ "Content-Type": "application/pdf" })
+        response = aws.put(upload_uri, body: File.open(source_pdf))
+        if response.status == 200
+          asset_id
+        else
+          Result.new(nil, "Unexpected response status from asset upload: #{response.status}")
+        end
+      end
+
+      def delete_the_asset(asset_id)
+        api.delete("#{ASSETS_ENDPOINT}/#{asset_id}")
+      end
+
+      def execute(source_pdf)
+        asset_id = upload_asset(source_pdf)
+        response = api.post(OCR_ENDPOINT, json: { "assetID": asset_id })
+        if response.status == 201
+          document_url = response.headers["location"]
+          poll_document_result(document_url, asset_id)
+        else
+          Result.new(nil, "Unexpected response status from ocr endpoint: #{response.status}\nasset_id: #{asset_id}")
+        end
+      end
+
+      private
+
+      def api_headers
+        {
+          Authorization: "Bearer #{JwtProvider.get_jwt(@credentials)}",
+          "x-api-key": @credentials.client_id,
+          "Content-Type": "application/json"
+        }
+      end
+
+      def api
+        @api ||= HTTP.headers(api_headers)
+      end
+
+      def poll_document_result(url, original_asset_id)
+        sleep(1)
+        response = api.get(url)
+        if response.status == 200
+          json_response =  JSON.parse(response.body.to_s)
+          ocr_asset_id = json_response&.[]("asset")&.[]("assetID")
+          case json_response["status"]
+          when "in progress"
+            poll_document_result(url, original_asset_id)
+          when "done"
+            # download_the_asset
+            response = HTTP.get(json_response["asset"]["downloadUri"])
+            # delete the assets
+            delete_the_asset(original_asset_id) if original_asset_id.present?
+            delete_the_asset(ocr_asset_id) if ocr_asset_id.present?
+            # return the result
+            Result.new(response.body, nil)
+          when "failed"
+            # delete the original asset
+            delete_the_asset(original_asset_id) if original_asset_id.present?
+            Result.new(nil, "OCR Failed")
+          else
+            # delete the original asset
+            delete_the_asset(original_asset_id) if original_asset_id.present?
+            Result.new(nil, "Unexpected status from polling: #{json_response["status"]}")
+          end
+        else
+          # delete the original asset
+          delete_the_asset(original_asset_id) if original_asset_id.present?
+          Result.new(nil, "Unexpected response status from polling: #{json_response["status"]}")
+        end
+      end
+    end
+  end
+end
diff --git a/lib/pdfservices/ocr/result.rb b/lib/pdfservices/ocr/result.rb
new file mode 100644
index 0000000..90f4266
--- /dev/null
+++ b/lib/pdfservices/ocr/result.rb
@@ -0,0 +1,24 @@
+require "json"
+require "multipart_parser/reader"
+
+module PdfServices
+  module Ocr
+    class Result
+      attr_accessor :document_body, :error
+
+      def initialize(document_body, error)
+        @document_body = document_body
+        @error = error
+      end
+
+      def success?
+        @document_body != nil
+      end
+
+      def save_as_file(file_path)
+        location = File.join(Dir.pwd, file_path)
+        File.write(location, @document_body)
+      end
+    end
+  end
+end
diff --git a/lib/pdfservices/version.rb b/lib/pdfservices/version.rb
index f4a5a35..39032cc 100644
--- a/lib/pdfservices/version.rb
+++ b/lib/pdfservices/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module PdfServices
-  VERSION = "0.1.1"
+  VERSION = "0.1.2"
 end
diff --git a/test/fixtures/files/fake_ocr_done.pdf b/test/fixtures/files/fake_ocr_done.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..1344874964a91804eb152e91365a0a0345b6ef7a
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/test/fixtures/files/not_yet_ocr.pdf b/test/fixtures/files/not_yet_ocr.pdf
new file mode 100644
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GIT binary patch
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literal 0
HcmV?d00001

diff --git a/test/fixtures/ocr_done.json b/test/fixtures/ocr_done.json
new file mode 100644
index 0000000..e85e094
--- /dev/null
+++ b/test/fixtures/ocr_done.json
@@ -0,0 +1,3 @@
+{
+  "status": "in progress"
+}
diff --git a/test/fixtures/ocr_in_progress.json b/test/fixtures/ocr_in_progress.json
new file mode 100644
index 0000000..c35e347
--- /dev/null
+++ b/test/fixtures/ocr_in_progress.json
@@ -0,0 +1,7 @@
+{
+  "status": "done",
+  "asset": {
+    "assetID": "ocr'd:asset-id",
+    "downloadUri": "https://ocr.file.url"
+  }
+}
diff --git a/test/fixtures/presigned_upload_url_response.json b/test/fixtures/presigned_upload_url_response.json
new file mode 100644
index 0000000..21751bc
--- /dev/null
+++ b/test/fixtures/presigned_upload_url_response.json
@@ -0,0 +1,4 @@
+{
+  "assetID": "urn:a-real-long-asset-asset-id",
+  "uploadUri": "https://a.presigned.url"
+}
diff --git a/test/integration_spikes/ocr.rb b/test/integration_spikes/ocr.rb
new file mode 100644
index 0000000..b7cc334
--- /dev/null
+++ b/test/integration_spikes/ocr.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+require "lib/pdfservices"
+
+credentials = ::PdfServices::CredentialsBuilder.new
+  .with_client_id(ENV["PDF_SERVICES_CLIENT_ID"])
+  .with_client_secret(ENV["PDF_SERVICES_CLIENT_SECRET"])
+  .with_organization_id(ENV["PDF_SERVICES_ORGANIZATION_ID"])
+  .with_account_id(ENV["PDF_SERVICES_ACCOUNT_ID"])
+  .with_private_key(ENV["PDF_SERVICES_PRIVATE_KEY"])
+  .build
+
+operation = ::PdfServices::Ocr::Operation.new(credentials)
+
+result = operation.execute("test/fixtures/files/not_yet_ocr.pdf")
+
+puts(result.error)
+
+result.save_as_file("tmp/ocr_result.pdf")
diff --git a/test/pdf_services_sdk/test_integration.rb b/test/pdf_services_sdk/test_document_merge.rb
similarity index 97%
rename from test/pdf_services_sdk/test_integration.rb
rename to test/pdf_services_sdk/test_document_merge.rb
index 9f93194..76165de 100644
--- a/test/pdf_services_sdk/test_integration.rb
+++ b/test/pdf_services_sdk/test_document_merge.rb
@@ -2,7 +2,7 @@
 
 require "test_helper"
 
-class IntegrationTest < Minitest::Test
+class DocumentMergeTest < Minitest::Test
   def test_it_works
     stub_valid_response_sequence
 
diff --git a/test/pdf_services_sdk/test_ocr.rb b/test/pdf_services_sdk/test_ocr.rb
new file mode 100644
index 0000000..8d4f147
--- /dev/null
+++ b/test/pdf_services_sdk/test_ocr.rb
@@ -0,0 +1,88 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+class OcrTest < Minitest::Test
+  def test_it_works
+    stub_valid_response_sequence
+
+    # Initial setup, create credentials instance.
+    credentials = valid_credentials
+
+    # source file
+    source_pdf_path = File.join(Dir.pwd, "test", "fixtures", "files", "not_yet_ocr.pdf")
+
+    operation = ::PdfServices::Ocr::Operation.new(credentials)
+
+    # Execute the operation
+    result = operation.execute(source_pdf_path)
+
+    assert result.success?
+    assert_equal "this is fake ocr'd pdf\n", result.document_body.to_s
+  end
+
+  private
+
+  def stub_valid_response_sequence
+    # get JWT for requests
+    stub_request(:post, "https://ims-na1.adobelogin.com/ims/exchange/jwt/")
+      .to_return(status: 200, body: json_fixture("valid_jwt_response"))
+
+    # get a presigned url to upload the source pdf
+    stub_request(:post, "https://pdf-services.adobe.io/assets")
+      .with(headers: secured_headers)
+      .to_return(
+        status: 200,
+        headers: json_headers,
+        body: json_fixture("presigned_upload_url_response")
+      )
+
+    # upload the source pdf
+    stub_request(:put, "https://a.presigned.url").to_return(status: 200)
+
+    # request the OCR operation
+    stub_request(:post, "https://pdf-services.adobe.io/operation/ocr")
+      .with(headers: secured_headers)
+      .to_return(
+        status: 201,
+        headers: {"location" => "https://some.polling.url"}.merge(json_headers)
+      )
+
+    # poll for the result
+    stub_request(:get, "https://some.polling.url")
+      .with(headers: secured_headers)
+      .to_return(status: 200, headers: json_headers, body: json_fixture("ocr_in_progress"))
+      .to_return(status: 200, headers: json_headers, body: json_fixture("ocr_in_progress"))
+      .to_return(status: 200, headers: json_headers, body: json_fixture("ocr_done"))
+
+    # download the ocr'd pdf
+    stub_request(:get, "https://ocr.file.url")
+      .to_return(status: 200, headers: pdf_headers, body: file_fixture("fake_ocr_done.pdf"))
+
+    # delete the original asset
+    stub_request(:delete, "https://pdf-services.adobe.io/assets/urn:a-real-long-asset-asset-id")
+      .with(headers: secured_headers)
+      .to_return(status: 200, body: "", headers: {})
+
+    # delete the ocr'd asset
+    stub_request(:delete, "https://pdf-services.adobe.io/assets/ocr'd:asset-id")
+      .with(headers: secured_headers)
+      .to_return(status: 200, body: "", headers: {})
+  end
+
+  def secured_headers
+    {
+      "Authorization": "Bearer fake1.fake2.fake3",
+      "Content-Type": "application/json",
+      "X-Api-Key": "123someclientid"
+    }
+  end
+
+  def json_headers
+    {"Content-Type" => "application/json;charset=UTF-8"}
+  end
+
+  def pdf_headers
+    {"Content-Type" => "application/pdf"}
+  end
+end

From 84514660039f85f3115e86189f9f4c8add62fbc6 Mon Sep 17 00:00:00 2001
From: Jimmy Bosse <jimmy.bosse@ankura.com>
Date: Mon, 23 Jan 2023 11:59:02 -0500
Subject: [PATCH 2/4] update readme

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 7204c3b..f302dbc 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ Then you need to create a json file with your credentials:
 ```
 ### Supported API calls:
 
-- Document merge. See `test/pdf_services_sdk/test_integration.rb` for an example usage.
+- Document merge. See `test/pdf_services_sdk/test_document_merge.rb` for an example usage.
 - OCR. See `test/pdf_services_sdk/test_ocr.rb` for an example usage.
 
 ## Development

From df388138306cf7a41995779f4ccc3422ff8b9f46 Mon Sep 17 00:00:00 2001
From: Jimmy Bosse <jimmy.bosse@ankura.com>
Date: Mon, 23 Jan 2023 15:55:25 -0500
Subject: [PATCH 3/4] TIL the version matters for the gemlock

---
 Gemfile.lock | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Gemfile.lock b/Gemfile.lock
index 6383c1d..5e720dc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    pdfservices (0.1.1)
+    pdfservices (0.1.2)
       http (~> 5.1)
       json (~> 2.6)
       jwt (>= 1.0, < 3.0)
@@ -22,7 +22,7 @@ GEM
       ffi (>= 1.0.0)
       rake
     hashdiff (1.0.1)
-    http (5.1.0)
+    http (5.1.1)
       addressable (~> 2.8)
       http-cookie (~> 1.0)
       http-form_data (~> 2.2)
@@ -31,7 +31,7 @@ GEM
       domain_name (~> 0.5)
     http-form_data (2.3.0)
     json (2.6.2)
-    jwt (2.5.0)
+    jwt (2.6.0)
     llhttp-ffi (0.4.0)
       ffi-compiler (~> 1.0)
       rake (~> 13.0)
@@ -74,9 +74,9 @@ GEM
       hashdiff (>= 0.4.0, < 2.0.0)
 
 PLATFORMS
+  arm64-darwin-21
   ruby
   x86_64-linux
-  arm64-darwin-21
 
 DEPENDENCIES
   minitest (~> 5.0)

From ad3b729b4383ddf106e577f6d90bdef26ba7f665 Mon Sep 17 00:00:00 2001
From: Jimmy Bosse <jimmy.bosse@ankura.com>
Date: Mon, 23 Jan 2023 16:02:07 -0500
Subject: [PATCH 4/4] Greening

---
 lib/pdfservices/ocr/operation.rb  | 16 ++++++++--------
 test/pdf_services_sdk/test_ocr.rb |  2 +-
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/lib/pdfservices/ocr/operation.rb b/lib/pdfservices/ocr/operation.rb
index c1561f1..83e20f2 100644
--- a/lib/pdfservices/ocr/operation.rb
+++ b/lib/pdfservices/ocr/operation.rb
@@ -17,7 +17,7 @@ def initialize(credentials = nil)
       end
 
       def get_presigned_url
-        response = api.post(PRESIGNED_URL_ENDPOINT, json: { mediaType: "application/pdf" })
+        response = api.post(PRESIGNED_URL_ENDPOINT, json: {mediaType: "application/pdf"})
         if response.status == 200
           JSON.parse(response.body.to_s)
         else
@@ -26,10 +26,10 @@ def get_presigned_url
       end
 
       def upload_asset(source_pdf)
-        presigned_url = get_presigned_url()
+        presigned_url = get_presigned_url
         upload_uri = presigned_url["uploadUri"]
         asset_id = presigned_url["assetID"]
-        aws = HTTP.headers({ "Content-Type": "application/pdf" })
+        aws = HTTP.headers({"Content-Type": "application/pdf"})
         response = aws.put(upload_uri, body: File.open(source_pdf))
         if response.status == 200
           asset_id
@@ -44,7 +44,7 @@ def delete_the_asset(asset_id)
 
       def execute(source_pdf)
         asset_id = upload_asset(source_pdf)
-        response = api.post(OCR_ENDPOINT, json: { "assetID": asset_id })
+        response = api.post(OCR_ENDPOINT, json: {assetID: asset_id})
         if response.status == 201
           document_url = response.headers["location"]
           poll_document_result(document_url, asset_id)
@@ -71,7 +71,7 @@ def poll_document_result(url, original_asset_id)
         sleep(1)
         response = api.get(url)
         if response.status == 200
-          json_response =  JSON.parse(response.body.to_s)
+          json_response = JSON.parse(response.body.to_s)
           ocr_asset_id = json_response&.[]("asset")&.[]("assetID")
           case json_response["status"]
           when "in progress"
@@ -80,13 +80,13 @@ def poll_document_result(url, original_asset_id)
             # download_the_asset
             response = HTTP.get(json_response["asset"]["downloadUri"])
             # delete the assets
-            delete_the_asset(original_asset_id) if original_asset_id.present?
-            delete_the_asset(ocr_asset_id) if ocr_asset_id.present?
+            delete_the_asset(original_asset_id) if !original_asset_id.nil?
+            delete_the_asset(ocr_asset_id) if !ocr_asset_id.nil?
             # return the result
             Result.new(response.body, nil)
           when "failed"
             # delete the original asset
-            delete_the_asset(original_asset_id) if original_asset_id.present?
+            delete_the_asset(original_asset_id) if !original_asset_id.nil?
             Result.new(nil, "OCR Failed")
           else
             # delete the original asset
diff --git a/test/pdf_services_sdk/test_ocr.rb b/test/pdf_services_sdk/test_ocr.rb
index 8d4f147..e890ac2 100644
--- a/test/pdf_services_sdk/test_ocr.rb
+++ b/test/pdf_services_sdk/test_ocr.rb
@@ -72,7 +72,7 @@ def stub_valid_response_sequence
 
   def secured_headers
     {
-      "Authorization": "Bearer fake1.fake2.fake3",
+      Authorization: "Bearer fake1.fake2.fake3",
       "Content-Type": "application/json",
       "X-Api-Key": "123someclientid"
     }