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author | Matthew Wild <mwild1@gmail.com> |
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date | Wed, 04 Oct 2017 10:54:52 +0100 |
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1 --- |
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2 description: HTTP File Upload (external service) |
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3 labels: 'Stage-Alpha' |
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4 --- |
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5 |
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6 Introduction |
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7 ============ |
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8 |
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9 This module implements [XEP-0363], which lets clients upload files |
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10 over HTTP to an external web server. |
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11 |
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12 This module generates URLs that are signed using a HMAC. Any web service that can authenticate |
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13 these URLs can be used. There is a PHP implementation available |
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14 [here](https://hg.prosody.im/prosody-modules/raw-file/tip/mod_http_upload_external/share.php). To |
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15 implement your own service compatible with this module, check out the implementation notes below (and if you |
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16 publish your implementation - let us know!). |
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17 |
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18 Configuration |
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19 ============= |
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20 |
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21 Add `"http_upload_external"` to modules_enabled in your global section, or under the host(s) you wish |
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22 to use it on. |
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23 |
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24 External URL |
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25 ------------ |
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26 |
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27 You need to provide the path to the external service. Ensure it ends with '/'. |
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28 |
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29 For example, to use the PHP implementation linked above, you might set it to: |
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30 |
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31 ``` {.lua} |
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32 http_upload_external_base_url = "https://your.example.com/path/to/share.php/" |
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33 ``` |
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34 |
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35 Secret |
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36 ------ |
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37 |
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38 Set a long and unpredictable string as your secret. This is so the upload service can verify that |
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39 the upload comes from mod_http_upload_external, and random strangers can't upload to your server. |
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40 |
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41 ``` {.lua} |
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42 http_upload_external_secret = "this is a secret string!" |
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43 ``` |
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44 |
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45 You need to set exactly the same secret string in your external service. |
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46 |
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47 Limits |
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48 ------ |
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49 |
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50 A maximum file size can be set by: |
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51 |
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52 ``` {.lua} |
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53 http_upload_external_file_size_limit = 123 -- bytes |
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54 ``` |
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55 |
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56 Default is 100MB (100\*1024\*1024). |
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57 |
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58 Compatibility |
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59 ============= |
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60 |
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61 Works with Prosody 0.9.x and later. |
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62 |
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63 Implementation |
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64 ============== |
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65 |
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66 To implement your own external service that is compatible with this module, you need to expose a |
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67 simple API that allows the HTTP GET, HEAD and PUT methods on arbitrary URLs located on your service. |
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68 |
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69 For example, if http_upload_external_base_url is set to `https://example.com/upload/` then your service |
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70 might receive the following requests: |
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71 |
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72 Upload a new file: |
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73 |
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74 ``` |
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75 PUT https://example.com/upload/foo/bar.jpg?v=49e9309ff543ace93d25be90635ba8e9965c4f23fc885b2d86c947a5d59e55b2 |
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76 ``` |
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77 |
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78 Recipient checks the file size and other headers: |
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79 |
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80 ``` |
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81 HEAD https://example.com/upload/foo/bar.jpg |
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82 ``` |
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83 |
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84 Recipient downloads the file: |
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85 |
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86 ``` |
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87 GET https://example.com/upload/foo/bar.jpg |
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88 ``` |
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89 |
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90 The only tricky logic is in validation of the PUT request. Firstly, don't overwrite existing files (return 409 Conflict). |
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91 |
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92 Then you need to validate the auth token. This will be in the URL query parameter 'v'. If it is absent, fail with 403 Forbidden. |
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93 |
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94 Calculate the expected auth token by reading the value of the Content-Length header of the PUT request. E.g. for a 1MB file |
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95 will have a Content-Length of '1048576'. Append this to the uploaded file name, separated by a space (0x20) character. |
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96 |
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97 For the above example, you would end up with the following string: "foo/bar.jpg 1048576" |
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98 |
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99 The auth token is a SHA256 HMAC of this string, using the configured secret as the key. E.g. |
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100 |
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101 ``` |
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102 calculated_auth_token = hmac_sha256("foo/bar.jpg 1048576", "secret string") |
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103 ``` |
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104 |
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105 If this is not equal to the 'v' parameter provided in the upload URL, reject the upload with 403 Forbidden. |
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106 |
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107 Note: your language/environment may provide a function for doing a constant-time comparison of these, to guard against |
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108 timing attacks that may be used to discover the secret key. |