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# mod_alias (inets v9.4)

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URL aliasing.

Erlang web server internal API for handling of, for example, interaction data exported by module `mod_alias`.

# Summary

## Functions

default_index(ConfigDB, Path)

If `Path` is a directory, `default_index/2`, it starts searching for resources or files that are specified in the config directive `DirectoryIndex`. If an appropriate resource or file is found, it is appended to the end of `Path` and then returned. `Path` is returned unaltered if no appropriate file is found or if `Path` is not a directory. `config_db()` is the server config file in ETS table format as described in Inets User's Guide.

path(Data, ConfigDB, RequestURI)

`path/3` returns the file `Path` in the `RequestURI` (see RFC 1945). If the interaction data `{real_name, {Path, AfterPath}}` has been exported by `mod_alias`, `Path` is returned. If no interaction data has been exported, `ServerRoot` is used to generate a file `Path`. `config_db()` and `interaction_data()` are as defined in Inets User's Guide.

real_name(ConfigDB, RequestURI, Aliases)

`real_name/3` traverses `Aliases`, typically extracted from `ConfigDB`, and matches each `FakeName` with `RequestURI`. If a match is found, `FakeName` is replaced with `RealName` in the match. The resulting path is split into two parts, `ShortPath` and `AfterPath`, as defined in `httpd_util:split_path/1`. `Path` is generated from `ShortPath`, that is, the result from `default_index/2` with `ShortPath` as an argument. `config_db()` is the server config file in ETS table format as described in Inets User's Guide.

real_script_name(ConfigDB, RequestURI, ScriptAliases)

`real_script_name/3` traverses `ScriptAliases`, typically extracted from `ConfigDB`, and matches each `FakeName` with `RequestURI`. If a match is found, `FakeName` is replaced with `RealName` in the match. If the resulting match is not an executable script, `not_a_script` is returned. If it is a script, the resulting script path is in two parts, `ShortPath` and `AfterPath`, as defined in `httpd_util:split_script_path/1`. `config_db()` is the server config file in ETS table format as described in Inets User's Guide.

# Functions

# default_index(ConfigDB, Path)

    -spec default_index(ConfigDB, Path) -> NewPath
                           when ConfigDB :: ets:tid(), Path :: string(), NewPath :: string().

If `Path` is a directory, `default_index/2`, it starts searching for resources or files that are specified in the config directive `DirectoryIndex`. If an appropriate resource or file is found, it is appended to the end of `Path` and then returned. `Path` is returned unaltered if no appropriate file is found or if `Path` is not a directory. `config_db()` is the server config file in ETS table format as described in Inets User's Guide.

# path(Data, ConfigDB, RequestURI)

    -spec path(Data, ConfigDB, RequestURI) -> Path
                  when
                      Data :: [{real_name, {Path, AfterPath}}],
                      ConfigDB :: ets:tid(),
                      RequestURI :: string(),
                      AfterPath :: string(),
                      Path :: string().

`path/3` returns the file `Path` in the `RequestURI` (see RFC 1945). If the interaction data `{real_name, {Path, AfterPath}}` has been exported by `mod_alias`, `Path` is returned. If no interaction data has been exported, `ServerRoot` is used to generate a file `Path`. `config_db()` and `interaction_data()` are as defined in Inets User's Guide.

# real_name(ConfigDB, RequestURI, Aliases)

    -spec real_name(ConfigDB, RequestURI, Aliases) -> ReturnPath
                       when
                           ConfigDB :: ets:tid(),
                           RequestURI :: string(),
                           Aliases :: [{FakeName, RealName}],
                           ReturnPath :: {ShortPath, Path, AfterPath},
                           FakeName :: re:mp() | iodata() | unicode:charlist() | string(),
                           RealName :: string(),
                           ShortPath :: string(),
                           Path :: string(),
                           AfterPath :: string().

`real_name/3` traverses `Aliases`, typically extracted from `ConfigDB`, and matches each `FakeName` with `RequestURI`. If a match is found, `FakeName` is replaced with `RealName` in the match. The resulting path is split into two parts, `ShortPath` and `AfterPath`, as defined in `httpd_util:split_path/1`. `Path` is generated from `ShortPath`, that is, the result from `default_index/2` with `ShortPath` as an argument. `config_db()` is the server config file in ETS table format as described in Inets User's Guide.

# real_script_name(ConfigDB, RequestURI, ScriptAliases)

    -spec real_script_name(ConfigDB, RequestURI, ScriptAliases) -> ReturnPath | not_a_script
                              when
                                  ConfigDB :: ets:tid(),
                                  RequestURI :: string(),
                                  ScriptAliases :: list() | [{FakeName, RealName}],
                                  ReturnPath :: {ShortPath, AfterPath},
                                  FakeName :: re:mp() | iodata() | unicode:charlist() | string(),
                                  RealName :: string(),
                                  ShortPath :: string(),
                                  AfterPath :: term().

`real_script_name/3` traverses `ScriptAliases`, typically extracted from `ConfigDB`, and matches each `FakeName` with `RequestURI`. If a match is found, `FakeName` is replaced with `RealName` in the match. If the resulting match is not an executable script, `not_a_script` is returned. If it is a script, the resulting script path is in two parts, `ShortPath` and `AfterPath`, as defined in `httpd_util:split_script_path/1`. `config_db()` is the server config file in ETS table format as described in Inets User's Guide.