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1 .. _google:
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4 Google Cloud Platform plugin
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5 ============================
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6
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7 .. contents::
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8
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9
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10 Introduction
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11 ------------
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12
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13 Osimis freely provides the `source code
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14 <https://bitbucket.org/osimis/orthanc-gcp/src>`__ of a plugin to
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15 interface Orthanc with the Healthcare API of `Google Cloud Platform
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16 (GCP) <https://en.wikipedia.org/wiki/Google_Cloud_Platform>`__ thanks
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17 to `DICOMweb <https://www.dicomstandard.org/dicomweb/>`__.
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18
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19 This GCP plugin notably enables the upload of DICOM images through
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20 STOW-RS, the querying of the cloud content through QIDO-RS, and the
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21 retrieval of remote content through WADO-RS. These operations can be
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22 possibly scripted thanks to the REST API of Orthanc.
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23
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24 Concretely, the GCP plugin manages the credentials to Google Cloud
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25 Platform. It requires the official :ref:`DICOMweb plugin <dicomweb>`
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26 to be installed. As soon as Orthanc is started, the GCP plugin
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27 automatically acquires and refreshes the `authentication tokens
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28 <https://cloud.google.com/docs/authentication/>`__, transparently
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29 updating the remote :ref:`DICOMweb servers <dicomweb-client-config>`
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30 that are known to the DICOMweb plugin. The authentication tokens can
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31 be derived either from service accounts, or from user accounts.
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32
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33 This page makes the assumption that you have created a Google Cloud
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34 Platform project, in which you have enabled the `Healthcare API
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35 <https://cloud.google.com/healthcare/>`__, and in which you have
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36 created a `DICOM store
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37 <https://cloud.google.com/healthcare/docs/how-tos/dicom>`__.
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38
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39 Under the hood, the GCP plugin is built on the top of the official
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40 `Google Cloud Platform C++ Client Libraries
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41 <https://github.com/googleapis/google-cloud-cpp>`__.
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42
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43
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44
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45 Compilation
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46 -----------
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47
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48 .. highlight:: text
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49
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50 The procedure to compile the GCP plugin is similar of that for the
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51 :ref:`core of Orthanc <compiling>`. The following commands should work
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52 on any recent UNIX-like distribution (including GNU/Linux)::
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53
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54 $ mkdir Build
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55 $ cd Build
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56 $ cmake .. -DSTATIC_BUILD=ON -DCMAKE_BUILD_TYPE=Release
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57 $ make
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58
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59 The compilation produces a shared library
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60 ``OrthancGoogleCloudPlatform`` that contains the DICOMweb
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61 plugin. Pre-compiled binaries for Microsoft Windows `are available
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62 <http://www.orthanc-server.com/browse.php?path=/plugin-google-cloud>`__,
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63 and are included in the `Windows installers
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64 <https://www.orthanc-server.com/download-windows.php>`__.
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65
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66
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67
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68 Configuration
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69 -------------
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70
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71
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72 Common parameters
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73 ^^^^^^^^^^^^^^^^^
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74
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75 As explained above, the GCP plugin requires the :ref:`official
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76 DICOMweb plugin <dicomweb>` to be installed (with version above
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77 1.0).
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78
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79 Furthermore, as obtaining the authentication tokens for Google Cloud
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80 Platform necessitates a sequence of HTTPS requests, the Orthanc
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81 :ref:`configuration options <configuration>` must specify how the
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82 authenticity of the Google servers is checked. You have two
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83 possibilities to that end:
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84
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85 1. Disabling the verification of the remote servers (**not recommended
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86 in production**). This is done by setting option ``HttpsVerifyPeers``
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87 to ``false``.
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88
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89 2. Providing a list of `trusted Certificate Authorities (CA)
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90 <https://curl.haxx.se/docs/sslcerts.html>`__ to the HTTPS client
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91 that is internally used by Orthanc (namely, `cURL
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92 <https://en.wikipedia.org/wiki/CURL>`__). This is done by properly
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93 setting ``HttpsVerifyPeers`` option, so that it points to a file
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94 containing a store of CA certificates. Depending on your operating
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95 system, this file can be found as follows:
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96
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97 * On Debian-based system, the standard file
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98 ``/etc/ssl/certs/ca-certificates.crt`` can be used.
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99 * On other systems, the cURL project provides `CA certificates
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100 <https://curl.haxx.se/docs/caextract.html>`__ that are extracted
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101 from Mozilla.
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102
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103 Note that to debug HTTPS communications, you have the possibility
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104 of setting the ``HttpVerbose`` configuration option of Orthanc to ``true``.
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105
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106
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107
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108 Service account
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109 ^^^^^^^^^^^^^^^
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110
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111 As explained on the `Google documentation
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112 <https://cloud.google.com/docs/authentication/#service_accounts>`__,
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113 *"a service account is a Google account that represents an
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114 application, as opposed to representing an end user"*. This is
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115 presumably the most common situation in the case of Orthanc.
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116
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117 You first have to `create a service account
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118 <https://cloud.google.com/docs/authentication/getting-started#creating_a_service_account>`__
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119 for your application. This will produce a JSON file (say,
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120 ``dicom-osimis.json``) that you have to store securely on the server
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121 that will run Orthanc.
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122
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123 .. highlight:: json
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124
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125 Secondly, you have to modify the :ref:`Orthanc configuration
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126 <configuration>` in order to provide the GCP plugin with your service
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127 account file and with the parameters of your `DICOM store
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128 <https://cloud.google.com/healthcare/docs/how-tos/dicom>`__. Here is a
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129 sample, minimalist configuration of Orthanc::
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130
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131 {
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132 "HttpsCACertificates": "/etc/ssl/certs/ca-certificates.crt",
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133 "Plugins" : [ "." ],
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134 "GoogleCloudPlatform" : {
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135 "Accounts": {
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136 "my-google" : {
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137 "Project" : "osimis-test",
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138 "Location" : "europe-west2",
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139 "Dataset" : "test",
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140 "DicomStore" : "dicom",
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141 "ServiceAccountFile" : "dicom-osimis.json"
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142 }
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143 }
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144 }
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145 }
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146
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147
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148 In this example, once the GCP plugin has succeeded to authenticate
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149 using the service account, the DICOMweb plugin will provide access to
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150 the cloud DICOM store at URI ``/dicom-web/servers/my-google/`` of the
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151 REST API of Orthanc.
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152
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153
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154 User account
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155 ^^^^^^^^^^^^
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156
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157 User account is an alternative to service account, and can be used
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158 *"when the application needs to access resources on behalf of an end
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159 user"* (check out the `Google documentation
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160 <https://cloud.google.com/docs/authentication/#user_accounts>`__).
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161
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162 .. highlight:: json
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163
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164 The easiest way of setting up a user account is through the `gcloud
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165 command-line tool <https://cloud.google.com/sdk/gcloud/>`__.
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166 `Google's quick-starts
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167 <https://cloud.google.com/sdk/docs/quickstarts>`__ explain how to
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168 initialize the environment depending on your operating system (check
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169 out the "Initialize the SDK" sections, which essentially boil down to
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170 calling ``gcloud init``).
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171
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172
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173 .. highlight:: bash
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174
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175 Once the ``gcloud init`` command-line has been invoked, you can
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176 extract credentials for Orthanc by typing the following command::
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177
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178 $ gcloud auth print-access-token --format json
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179
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180
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181 .. highlight:: json
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182
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183 This command produces JSON file containing all the required
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184 information, that can be written to a file (say,
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185 ``dicom-user.json``). Given this file, here is a sample, minimalist
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186 configuration of Orthanc::
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187
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188 {
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189 "HttpsCACertificates": "/etc/ssl/certs/ca-certificates.crt",
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190 "Plugins" : [ "." ],
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191 "GoogleCloudPlatform" : {
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192 "Accounts": {
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193 "my-google" : {
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194 "Project" : "osimis-test",
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195 "Location" : "europe-west2",
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196 "Dataset" : "test",
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197 "DicomStore" : "dicom",
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198 "AuthorizedUserFile" : "dicom-osimis.json"
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199 }
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200 }
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201 }
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202 }
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203
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204 In this example, once the GCP plugin has succeeded to authenticate
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205 using the user account, the DICOMweb plugin will provide access to the
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206 cloud DICOM store at URI ``/dicom-web/servers/my-google/`` of the REST
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207 API of Orthanc.
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208
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209
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210 .. highlight:: bash
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211
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212 Note that only 3 fields in the JSON file produced by the ``gcloud auth
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213 print-access-token`` are required: ``client_id``, ``client_secret``,
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214 and ``refresh_token``. Instead of using the full JSON file, you can
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215 extract only these fields, e.g. using the `jq
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216 <https://stedolan.github.io/jq/>`__ command-line tool::
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217
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218 $ gcloud auth print-access-token --format json | jq '{ AuthorizedUserClientId: .client_id, AuthorizedUserClientSecret:.client_secret, AuthorizedUserRefreshToken:.refresh_token }'
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219 {
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220 "AuthorizedUserClientId": "XXXXXXXXXX.apps.googleusercontent.com",
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221 "AuthorizedUserClientSecret": "ZmssLNXXXXXX",
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222 "AuthorizedUserRefreshToken": "1/e2ngXXXXXX"
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223 }
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224
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225
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226 .. highlight:: json
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227
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228 You can copy/paste these fields as follows in order to create a
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229 configuration for Orthanc that is equivalent to the one using the full
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230 JSON::
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231
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232 {
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233 "HttpsCACertificates": "/etc/ssl/certs/ca-certificates.crt",
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234 "Plugins" : [ "." ],
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235 "GoogleCloudPlatform" : {
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236 "Accounts": {
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237 "my-google" : {
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238 "Project" : "osimis-test",
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239 "Location" : "europe-west2",
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240 "Dataset" : "test",
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241 "DicomStore" : "dicom",
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242 "AuthorizedUserClientId": "XXXXXXXXXX.apps.googleusercontent.com",
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243 "AuthorizedUserClientSecret": "ZmssLNXXXXXX",
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244 "AuthorizedUserRefreshToken": "1/e2ngXXXXXX"
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245 }
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246 }
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247 }
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248 }
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