prosody
817cadf6be92
util/error.lua

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util/error.lua @ 11320:817cadf6be92

mod_http_file_share: Handle content-type being optional
author Kim Alvefur <zash@zash.se>
date Wed, 27 Jan 2021 09:47:21 +0100
parent 11224:8143fd2f138b
child 12975:d10957394a3c
child 13078:6da83deb8d7f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local id = require "util.id";
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2
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3 local util_debug; -- only imported on-demand
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4
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5 -- Library configuration (see configure())
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6 local auto_inject_traceback = false;
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7
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8 local error_mt = { __name = "error" };
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9
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10 function error_mt:__tostring()
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11 return ("error<%s:%s:%s>"):format(self.type, self.condition, self.text or "");
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12 end
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13
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14 local function is_error(e)
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15 return getmetatable(e) == error_mt;
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16 end
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17
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18 local function configure(opt)
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19 if opt.auto_inject_traceback ~= nil then
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20 auto_inject_traceback = opt.auto_inject_traceback;
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21 if auto_inject_traceback then
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22 util_debug = require "util.debug";
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23 end
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24 end
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25 end
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26
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27 -- Do we want any more well-known fields?
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28 -- Or could we just copy all fields from `e`?
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29 -- Sometimes you want variable details in the `text`, how to handle that?
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30 -- Translations?
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31 -- Should the `type` be restricted to the stanza error types or free-form?
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32 -- What to set `type` to for stream errors or SASL errors? Those don't have a 'type' attr.
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33
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34 local function new(e, context, registry, source)
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35 if is_error(e) then return e; end
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36 local template = registry and registry[e];
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37 if not template then
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38 if type(e) == "table" then
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39 template = {
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40 code = e.code;
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41 type = e.type;
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42 condition = e.condition;
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43 text = e.text;
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44 extra = e.extra;
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45 };
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46 else
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47 template = {};
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48 end
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49 end
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50 context = context or {};
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51
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52 if auto_inject_traceback then
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53 context.traceback = util_debug.get_traceback_table(nil, 2);
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54 end
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55
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56 local error_instance = setmetatable({
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57 instance_id = id.short();
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58
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59 type = template.type or "cancel";
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60 condition = template.condition or "undefined-condition";
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61 text = template.text;
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62 code = template.code;
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63 extra = template.extra;
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64
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65 context = context;
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66 source = source;
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67 }, error_mt);
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68
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69 return error_instance;
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70 end
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71
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72 -- compact --> normal form
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73 local function expand_registry(namespace, registry)
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74 local mapped = {}
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75 for err,template in pairs(registry) do
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76 local e = {
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77 type = template[1];
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78 condition = template[2];
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79 text = template[3];
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80 };
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81 if namespace and template[4] then
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82 e.extra = { namespace = namespace, condition = template[4] };
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83 end
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84 mapped[err] = e;
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85 end
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86 return mapped;
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87 end
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88
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89 local function init(source, namespace, registry)
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90 if type(namespace) == "table" then
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91 -- registry can be given as second argument if namespace is not used
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92 registry, namespace = namespace, nil;
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93 end
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94 local _, protoerr = next(registry, nil);
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95 if protoerr and type(next(protoerr)) == "number" then
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96 registry = expand_registry(namespace, registry);
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97 end
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98
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99 local function wrap(e, context)
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100 if is_error(e) then
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101 return e;
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102 end
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103 local err = new(registry[e] or {
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104 type = "cancel", condition = "undefined-condition"
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105 }, context, registry, source);
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106 err.context.wrapped_error = e;
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107 return err;
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108 end
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109
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110 return {
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111 source = source;
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112 registry = registry;
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113 new = function (e, context)
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114 return new(e, context, registry, source);
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115 end;
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116 coerce = function (ok, err, ...)
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117 if ok then
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118 return ok, err, ...;
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119 end
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120 return nil, wrap(err);
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121 end;
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122 wrap = wrap;
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123 is_error = is_error;
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124 };
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125 end
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126
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127 local function coerce(ok, err, ...)
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128 if ok or is_error(err) then
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129 return ok, err, ...;
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130 end
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131
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132 local new_err = new({
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133 type = "cancel", condition = "undefined-condition"
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134 }, { wrapped_error = err });
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135
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136 return ok, new_err, ...;
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137 end
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138
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139 local function from_stanza(stanza, context, source)
11092
bd13aa89262d util.error: Collect Application-Specific Conditions from stanza errors
Kim Alvefur <zash@zash.se>
parents: 11091
diff changeset
140 local error_type, condition, text, extra_tag = stanza:get_error();
11089
35d2260644d9 util.error: Extract error originator from stanza errors
Kim Alvefur <zash@zash.se>
parents: 11081
diff changeset
141 local error_tag = stanza:get_child("error");
35d2260644d9 util.error: Extract error originator from stanza errors
Kim Alvefur <zash@zash.se>
parents: 11081
diff changeset
142 context = context or {};
35d2260644d9 util.error: Extract error originator from stanza errors
Kim Alvefur <zash@zash.se>
parents: 11081
diff changeset
143 context.stanza = stanza;
11090
33b6fbdcec88 util.error: Default error originator to stanza sender
Kim Alvefur <zash@zash.se>
parents: 11089
diff changeset
144 context.by = error_tag.attr.by or stanza.attr.from;
33b6fbdcec88 util.error: Default error originator to stanza sender
Kim Alvefur <zash@zash.se>
parents: 11089
diff changeset
145
11095
1ea3574b19c8 util.error: Turns out <gone> wasn't alone, there's also <redirect>
Kim Alvefur <zash@zash.se>
parents: 11094
diff changeset
146 local uri;
1ea3574b19c8 util.error: Turns out <gone> wasn't alone, there's also <redirect>
Kim Alvefur <zash@zash.se>
parents: 11094
diff changeset
147 if condition == "gone" or condition == "redirect" then
1ea3574b19c8 util.error: Turns out <gone> wasn't alone, there's also <redirect>
Kim Alvefur <zash@zash.se>
parents: 11094
diff changeset
148 uri = error_tag:get_child_text(condition, "urn:ietf:params:xml:ns:xmpp-stanzas");
1ea3574b19c8 util.error: Turns out <gone> wasn't alone, there's also <redirect>
Kim Alvefur <zash@zash.se>
parents: 11094
diff changeset
149 end
1ea3574b19c8 util.error: Turns out <gone> wasn't alone, there's also <redirect>
Kim Alvefur <zash@zash.se>
parents: 11094
diff changeset
150
11094
03fdf41fd948 util.error: Pass converted stanza errors throguh new()
Kim Alvefur <zash@zash.se>
parents: 11092
diff changeset
151 return new({
9749
9361bd1b9c9b util.error: Add a function for creating an error object from an error stanza
Kim Alvefur <zash@zash.se>
parents: 9746
diff changeset
152 type = error_type or "cancel";
9361bd1b9c9b util.error: Add a function for creating an error object from an error stanza
Kim Alvefur <zash@zash.se>
parents: 9746
diff changeset
153 condition = condition or "undefined-condition";
9361bd1b9c9b util.error: Add a function for creating an error object from an error stanza
Kim Alvefur <zash@zash.se>
parents: 9746
diff changeset
154 text = text;
11095
1ea3574b19c8 util.error: Turns out <gone> wasn't alone, there's also <redirect>
Kim Alvefur <zash@zash.se>
parents: 11094
diff changeset
155 extra = (extra_tag or uri) and {
1ea3574b19c8 util.error: Turns out <gone> wasn't alone, there's also <redirect>
Kim Alvefur <zash@zash.se>
parents: 11094
diff changeset
156 uri = uri;
11092
bd13aa89262d util.error: Collect Application-Specific Conditions from stanza errors
Kim Alvefur <zash@zash.se>
parents: 11091
diff changeset
157 tag = extra_tag;
11091
4b4b5188492f util.error: Add special case handling of <gone> with an URI
Kim Alvefur <zash@zash.se>
parents: 11090
diff changeset
158 } or nil;
11094
03fdf41fd948 util.error: Pass converted stanza errors throguh new()
Kim Alvefur <zash@zash.se>
parents: 11092
diff changeset
159 }, context, nil, source);
9749
9361bd1b9c9b util.error: Add a function for creating an error object from an error stanza
Kim Alvefur <zash@zash.se>
parents: 9746
diff changeset
160 end
9361bd1b9c9b util.error: Add a function for creating an error object from an error stanza
Kim Alvefur <zash@zash.se>
parents: 9746
diff changeset
161
9746
848fd204708c util.error: Add new util library for structured errors
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
162 return {
848fd204708c util.error: Add new util library for structured errors
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
163 new = new;
11054
ad07152d7bde util.error: Add a wrapper for common parameters
Kim Alvefur <zash@zash.se>
parents: 11053
diff changeset
164 init = init;
9746
848fd204708c util.error: Add new util library for structured errors
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
165 coerce = coerce;
11222
4b39691a274e util.error: rename is_err() -> is_error()
Matthew Wild <mwild1@gmail.com>
parents: 11221
diff changeset
166 is_error = is_error;
4b39691a274e util.error: rename is_err() -> is_error()
Matthew Wild <mwild1@gmail.com>
parents: 11221
diff changeset
167 is_err = is_error; -- COMPAT w/ older 0.12 trunk
9749
9361bd1b9c9b util.error: Add a function for creating an error object from an error stanza
Kim Alvefur <zash@zash.se>
parents: 9746
diff changeset
168 from_stanza = from_stanza;
11050
51be24b16e8a util.error: Allow optional tracebacks to be injected on errors
Matthew Wild <mwild1@gmail.com>
parents: 10501
diff changeset
169 configure = configure;
9746
848fd204708c util.error: Add new util library for structured errors
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
170 }