Mercurial > prosody-modules

annotate mod_storage_s3/mod_storage_s3.lua @ 5671:c8322c64a548

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mod_storage_s3: Implement keyvalue deletion
author Kim Alvefur <zash@zash.se>
date Sat, 14 Oct 2023 21:40:46 +0200
parents 2c9d72ef829e
children c74a96dc5d58
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1 local http = require "prosody.net.http";
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2 local array = require "prosody.util.array";
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3 local async = require "prosody.util.async";
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4 local hashes = require "prosody.util.hashes";
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5 local httputil = require "prosody.util.http";
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6 local it = require "prosody.util.iterators";
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7 local jid = require "prosody.util.jid";
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8 local json = require "prosody.util.json";
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9 local st = require "prosody.util.stanza";
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10 local xml = require "prosody.util.xml";
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11 local url = require "socket.url";
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12
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13 local hmac_sha256 = hashes.hmac_sha256;
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14 local sha256 = hashes.sha256;
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15
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16 local driver = {};
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17
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18 local bucket = module:get_option_string("s3_bucket", "prosody");
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19 local base_uri = module:get_option_string("s3_base_uri", "http://localhost:9000");
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20 local region = module:get_option_string("s3_region", "us-east-1");
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21
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22 local access_key = module:get_option_string("s3_access_key");
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23 local secret_key = module:get_option_string("s3_secret_key");
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24
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25 function driver:open(store, typ)
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26 local mt = self[typ or "keyval"]
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27 if not mt then
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28 return nil, "unsupported-store";
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29 end
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30 return setmetatable({ store = store; bucket = bucket; type = typ }, mt);
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31 end
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32
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33 local keyval = { };
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34 driver.keyval = { __index = keyval; __name = module.name .. " keyval store" };
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35
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36 local aws4_format = "AWS4-HMAC-SHA256 Credential=%s/%s, SignedHeaders=%s, Signature=%s";
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37
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38 local function new_request(method, path, query, payload)
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39 local request = url.parse(base_uri);
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40 request.path = path;
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41
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42 local payload_type = nil;
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43 if st.is_stanza(payload) then
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44 payload_type = "application/xml";
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45 payload = tostring(payload);
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46 elseif payload ~= nil then
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47 payload_type = "application/json";
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48 payload = json.encode(payload);
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49 end
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50
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51 local payload_hash = sha256(payload or "", true);
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52
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53 local now = os.time();
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54 local aws_datetime = os.date("!%Y%m%dT%H%M%SZ", now);
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55 local aws_date = os.date("!%Y%m%d", now);
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56
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57 local headers = {
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58 ["Accept"] = "*/*";
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59 ["Authorization"] = nil;
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60 ["Content-Type"] = payload_type;
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61 ["Host"] = request.authority;
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62 ["User-Agent"] = "Prosody XMPP Server";
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63 ["X-Amz-Content-Sha256"] = payload_hash;
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64 ["X-Amz-Date"] = aws_datetime;
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65 };
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66
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67 local canonical_uri = url.build({ path = request.path });
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68 local canonical_query = "";
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69 local canonical_headers = array();
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70 local signed_headers = array()
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71
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72 if query then
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73 local sorted_query = array();
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74 for name, value in it.sorted_pairs(query) do
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75 sorted_query:push({ name = name; value = value });
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76 end
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77 sorted_query:sort(function (a,b) return a.name < b.name end)
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78 canonical_query = httputil.formencode(sorted_query):gsub("%%%x%x", string.upper);
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79 request.query = canonical_query;
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80 end
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81
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82 for header_name, header_value in it.sorted_pairs(headers) do
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83 header_name = header_name:lower();
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84 canonical_headers:push(header_name .. ":" .. header_value .. "\n");
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85 signed_headers:push(header_name);
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86 end
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87
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88 canonical_headers = canonical_headers:concat();
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89 signed_headers = signed_headers:concat(";");
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90
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91 local scope = aws_date .. "/" .. region .. "/s3/aws4_request";
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92
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93 local canonical_request = method .. "\n"
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94 .. canonical_uri .. "\n"
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95 .. canonical_query .. "\n"
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96 .. canonical_headers .. "\n"
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97 .. signed_headers .. "\n"
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98 .. payload_hash;
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99
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100 local signature_payload = "AWS4-HMAC-SHA256" .. "\n" .. aws_datetime .. "\n" .. scope .. "\n" .. sha256(canonical_request, true);
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101
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102 -- This can be cached?
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103 local date_key = hmac_sha256("AWS4" .. secret_key, aws_date);
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104 local date_region_key = hmac_sha256(date_key, region);
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105 local date_region_service_key = hmac_sha256(date_region_key, "s3");
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106 local signing_key = hmac_sha256(date_region_service_key, "aws4_request");
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107
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108 local signature = hmac_sha256(signing_key, signature_payload, true);
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109
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110 headers["Authorization"] = string.format(aws4_format, access_key, scope, signed_headers, signature);
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111
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112 return http.request(url.build(request), { method = method; headers = headers; body = payload });
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113 end
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114
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115 -- coerce result back into Prosody data type
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116 local function on_result(response)
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117 local content_type = response.headers["content-type"];
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118 if content_type == "application/json" then
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119 return json.decode(response.body);
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120 elseif content_type == "application/xml" then
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121 return xml.parse(response.body);
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122 elseif content_type == "application/x-www-form-urlencoded" then
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123 return httputil.formdecode(response.body);
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124 else
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125 response.log("warn", "Unknown response data type %s", content_type);
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126 return response.body;
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127 end
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128 end
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129
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130 function keyval:_path(key)
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131 return url.build_path({
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132 is_absolute = true;
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133 bucket;
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134 jid.escape(module.host);
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135 jid.escape(self.store);
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136 jid.escape(key or "");
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137 })
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138 end
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139
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140 function keyval:get(user)
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141 return async.wait_for(new_request("GET", self:_path(user)):next(on_result));
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142 end
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143
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144 function keyval:set(user, data)
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145
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146 if data == nil or (type(data) == "table" and next(data) == nil) then
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147 return async.wait_for(new_request("DELETE", self:_path(user)));
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148 end
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149
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150 return async.wait_for(new_request("PUT", self:_path(user), nil, data));
5669
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151 end
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152
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153 function keyval:users()
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154 return nil, "not-implemented";
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155 end
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156
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157 module:provides("storage", driver);