Add ssh-key resource get to gitlab_net

This provides the integration point to the internal API to get the
ssh key from the internal API.

lib/gitlab_net.rb

@@ -56,6 +56,11 @@ class GitlabNet
     get("#{host}/check", read_timeout: CHECK_TIMEOUT)
   end
 
+  def ssh_key(fingerprint)
+    resp = get("#{host}/ssh-key?fingerprint=#{fingerprint}")
+    JSON.parse(resp.body) rescue nil
+  end
+
   protected
 
   def config

spec/gitlab_net_spec.rb

@@ -76,6 +76,34 @@ describe GitlabNet, vcr: true do
     end
   end
 
+  describe :ssh_key do
+    it "should return nil when the resource is not implemented" do
+      VCR.use_cassette("ssh-key-not-implemented") do
+        result = gitlab_net.ssh_key("whatever")
+        result.should be_nil
+      end
+    end
+
+    it "should return nil when the fingerprint is not found" do
+      VCR.use_cassette("ssh-key-not-found") do
+        result = gitlab_net.ssh_key("whatever")
+        result.should be_nil
+      end
+    end
+
+    it "should return a ssh key with a valid fingerprint" do
+      VCR.use_cassette("ssh-key-ok") do
+        result = gitlab_net.ssh_key("42:18:16")
+        result.should eq({
+          "created_at" => "2016-03-04T18:27:36.959Z",
+          "id" => 2,
+          "key" => "ssh-rsa a-made=up-rsa-key dummy@gitlab.com",
+          "title" => "some key title"
+        })
+      end
+    end
+  end
+
   describe :check_access do
     context 'ssh key with access to project' do
       it 'should allow pull access for dev.gitlab.org' do

spec/vcr_cassettes/ssh-key-not-found.yml

+---
+http_interactions:
+- request:
+    method: get
+    uri: https://dev.gitlab.org/api/v3/internal/ssh-key?fingerprint=whatever
+    body:
+      encoding: US-ASCII
+      string: secret_token=a123
+    headers:
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+      Accept:
+      - "*/*"
+      User-Agent:
+      - Ruby
+      Content-Type:
+      - application/x-www-form-urlencoded
+  response:
+    status:
+      code: 404
+      message: Not Found
+    headers:
+      Server:
+      - nginx
+      Date:
+      - Mon, 07 Mar 2016 12:09:59 GMT
+      Content-Type:
+      - text/html; charset=utf-8
+      Connection:
+      - keep-alive
+      Cache-Control:
+      - no-cache
+      Set-Cookie:
+      - _gitlab_session=a924e63729e538c9efe10fa8338077d7; path=/; expires=Mon, 14
+        Mar 2016 12:09:59 -0000; secure; HttpOnly
+      Status:
+      - 404 Not Found
+      X-Content-Type-Options:
+      - nosniff
+      X-Frame-Options:
+      - SAMEORIGIN
+      X-Request-Id:
+      - 275ad011-515f-4239-80be-e537fd7c9086
+      X-Runtime:
+      - '2.169401'
+      X-Xss-Protection:
+      - 1; mode=block
+    http_version: 
+  recorded_at: Mon, 07 Mar 2016 12:10:00 GMT
+recorded_with: VCR 2.4.0

spec/vcr_cassettes/ssh-key-not-implemented.yml

+---
+http_interactions:
+- request:
+    method: get
+    uri: https://dev.gitlab.org/api/v3/internal/ssh-key?fingerprint=whatever
+    body:
+      encoding: US-ASCII
+      string: secret_token=a123
+    headers:
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+      Accept:
+      - "*/*"
+      User-Agent:
+      - Ruby
+      Content-Type:
+      - application/x-www-form-urlencoded
+  response:
+    status:
+      code: 501
+      message: Not Implemented
+    headers:
+      Server:
+      - nginx
+      Date:
+      - Mon, 07 Mar 2016 12:09:59 GMT
+      Content-Type:
+      - text/html; charset=utf-8
+      Connection:
+      - keep-alive
+      Cache-Control:
+      - no-cache
+      Set-Cookie:
+      - _gitlab_session=a924e63729e538c9efe10fa8338077d7; path=/; expires=Mon, 14
+        Mar 2016 12:09:59 -0000; secure; HttpOnly
+      Status:
+      - 501 Not Implemented
+      X-Content-Type-Options:
+      - nosniff
+      X-Frame-Options:
+      - SAMEORIGIN
+      X-Request-Id:
+      - 275ad011-515f-4239-80be-e537fd7c9086
+      X-Runtime:
+      - '2.169401'
+      X-Xss-Protection:
+      - 1; mode=block
+    http_version: 
+  recorded_at: Mon, 07 Mar 2016 12:10:00 GMT
+recorded_with: VCR 2.4.0

spec/vcr_cassettes/ssh-key-ok.yml

+---
+http_interactions:
+- request:
+    method: get
+    uri: https://dev.gitlab.org/api/v3/internal/ssh-key?fingerprint=42:18:16
+    body:
+      encoding: US-ASCII
+      string: secret_token=a123
+    headers:
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+      Accept:
+      - "*/*"
+      User-Agent:
+      - Ruby
+      Content-Type:
+      - application/x-www-form-urlencoded
+  response:
+    status:
+      code: 200
+      message: OK
+    headers:
+      Server:
+      - nginx/1.1.19
+      Date:
+      - Wed, 03 Sep 2014 11:27:35 GMT
+      Content-Type:
+      - application/json
+      Connection:
+      - keep-alive
+      Status:
+      - 200 OK
+      Cache-Control:
+      - max-age=0, private, must-revalidate
+    body:
+      encoding: UTF-8
+      string: '{"id":2, "title":"some key title", "key":"ssh-rsa a-made=up-rsa-key dummy@gitlab.com", "created_at":"2016-03-04T18:27:36.959Z"}'
+    http_version: 
+  recorded_at: Mon, 07 Mar 2016 12:10:00 GMT
+recorded_with: VCR 2.4.0