wai-middleware-static-0.8.3: WAI middleware that serves requests to static files.

Safe Haskell	None
Language	Haskell2010

Network.Wai.Middleware.Static

Contents

Middlewares
Options
Cache Control
Policies
Utilities
MIME types

Description

Serve static files, subject to a policy that can filter or modify incoming URIs. The flow is:

incoming request URI ==> policies ==> exists? ==> respond

If any of the polices fail, or the file doesn't exist, then the middleware gives up and calls the inner application. If the file is found, the middleware chooses a content type based on the file extension and returns the file contents as the response.

Synopsis

static :: Middleware
staticPolicy :: Policy -> Middleware
unsafeStaticPolicy :: Policy -> Middleware
static' :: CacheContainer -> Middleware
staticPolicy' :: CacheContainer -> Policy -> Middleware
unsafeStaticPolicy' :: CacheContainer -> Policy -> Middleware
staticWithOptions :: Options -> Middleware
staticPolicyWithOptions :: Options -> Policy -> Middleware
unsafeStaticPolicyWithOptions :: Options -> Policy -> Middleware
data Options
cacheContainer :: Options -> CacheContainer
mimeTypes :: Options -> FilePath -> MimeType
defaultOptions :: Options
data CachingStrategy
- = NoCaching
- | PublicStaticCaching
- | CustomCaching (FileMeta -> RequestHeaders)
data FileMeta = FileMeta {
- fm_lastModified :: !ByteString
- fm_etag :: !ByteString
- fm_fileName :: FilePath
}
initCaching :: CachingStrategy -> IO CacheContainer
data CacheContainer
data Policy
(<|>) :: Policy -> Policy -> Policy
(>->) :: Policy -> Policy -> Policy
policy :: (String -> Maybe String) -> Policy
predicate :: (String -> Bool) -> Policy
addBase :: String -> Policy
addSlash :: Policy
contains :: String -> Policy
hasPrefix :: String -> Policy
hasSuffix :: String -> Policy
noDots :: Policy
isNotAbsolute :: Policy
only :: [(String, String)] -> Policy
tryPolicy :: Policy -> String -> Maybe String
getMimeType :: FilePath -> MimeType

Middlewares

static :: Middleware Source #

Serve static files out of the application root (current directory). If file is found, it is streamed to the client and no further middleware is run. Disables caching.

Note: for security reasons, this uses the noDots and isNotAbsolute policy by default.

staticPolicy :: Policy -> Middleware Source #

Serve static files subject to a Policy. Disables caching.

Note: for security reasons, this uses the noDots and isNotAbsolute policy by default.

unsafeStaticPolicy :: Policy -> Middleware Source #

Serve static files subject to a Policy. Unlike static and staticPolicy, this has no policies enabled by default and is hence insecure. Disables caching.

static' :: CacheContainer -> Middleware Source #

Deprecated: Use staticWithOptions instead. This function will be removed in the next major release.

Serve static files out of the application root (current directory). If file is found, it is streamed to the client and no further middleware is run. Allows a CachingStrategy.

Note: for security reasons, this uses the noDots and isNotAbsolute policy by default.

staticPolicy' :: CacheContainer -> Policy -> Middleware Source #

Deprecated: Use staticPolicyWithOptions instead. This function will be removed in the next major release.

Serve static files subject to a Policy using a specified CachingStrategy

Note: for security reasons, this uses the noDots and isNotAbsolute policy by default.

unsafeStaticPolicy' :: CacheContainer -> Policy -> Middleware Source #

Deprecated: Use unsafeStaticPolicyWithOptions instead. This function will be removed in the next major release.

Serve static files subject to a Policy. Unlike static and staticPolicy, this has no policies enabled by default, and is hence insecure. Also allows to set a CachingStrategy.

staticWithOptions :: Options -> Middleware Source #

Serve static files out of the application root (current directory). If file is found, it is streamed to the client and no further middleware is run. Takes Options.

Note: for security reasons, this uses the noDots and isNotAbsolute policy by default.

staticPolicyWithOptions :: Options -> Policy -> Middleware Source #

Serve static files subject to a Policy using specified Options

Note: for security reasons, this uses the noDots and isNotAbsolute policy by default.

unsafeStaticPolicyWithOptions :: Options -> Policy -> Middleware Source #

Serve static files subject to a Policy. Unlike staticWithOptions and staticPolicyWithOptions, this has no policies enabled by default and is hence insecure. Takes Options.

Options

data Options Source #

Options for staticWithOptions Middleware.

Options can be set using record syntax on defaultOptions with the fields below.

cacheContainer :: Options -> CacheContainer Source #

Cache container to use

mimeTypes :: Options -> FilePath -> MimeType Source #

Compute MimeType from file name

defaultOptions :: Options Source #

Default options.

Options
{ cacheContainer = CacheContainerEmpty -- no caching
, mimeTypes      = getMimeType         -- use defaultMimeLookup from Mime
}

Cache Control

data CachingStrategy Source #

A cache strategy which should be used to serve content matching a policy. Meta information is cached for a maxium of 100 seconds before being recomputed.

Constructors

NoCaching	Do not send any caching headers
PublicStaticCaching	Send common caching headers for public (non dynamic) static files
CustomCaching (FileMeta -> RequestHeaders)	Compute caching headers using the user specified function. See http://www.mobify.com/blog/beginners-guide-to-http-cache-headers/ for a detailed guide

data FileMeta Source #

Meta information about a file to calculate cache headers

Constructors

FileMeta
Fields fm_lastModified :: !ByteString fm_etag :: !ByteString fm_fileName :: FilePath

Instances

Instances details

Eq FileMeta Source #
Instance details Defined in Network.Wai.Middleware.Static Methods (==) :: FileMeta -> FileMeta -> Bool (/=) :: FileMeta -> FileMeta -> Bool
Show FileMeta Source #
Instance details Defined in Network.Wai.Middleware.Static Methods showsPrec :: Int -> FileMeta -> ShowS show :: FileMeta -> String showList :: [FileMeta] -> ShowS

initCaching :: CachingStrategy -> IO CacheContainer Source #

Initialize caching. This should only be done once per application launch.

data CacheContainer Source #

Container caching file meta information. Create using initCaching

Policies

data Policy Source #

Take an incoming URI and optionally modify or filter it. The result will be treated as a filepath.

Instances

Instances details

Semigroup Policy Source #	Note: `(<>)` == `>->` (policy sequencing)
Instance details Defined in Network.Wai.Middleware.Static Methods (<>) :: Policy -> Policy -> Policy sconcat :: NonEmpty Policy -> Policy stimes :: Integral b => b -> Policy -> Policy
Monoid Policy Source #	Note: `mempty` == `policy Just` (the always accepting policy) `mappend` == `>->` (policy sequencing)
Instance details Defined in Network.Wai.Middleware.Static Methods mempty :: Policy mappend :: Policy -> Policy -> Policy mconcat :: [Policy] -> Policy

(<|>) :: Policy -> Policy -> Policy infixr 4 Source #

Choose between two policies. If the first fails, run the second.

(>->) :: Policy -> Policy -> Policy infixr 5 Source #

Sequence two policies. They are run from left to right. (Note: this is mappend)

policy :: (String -> Maybe String) -> Policy Source #

Lift a function into a Policy

predicate :: (String -> Bool) -> Policy Source #

Lift a predicate into a Policy

addBase :: String -> Policy Source #

Add a base path to the URI

staticPolicy (addBase "/home/user/files")

GET "foo/bar" looks for "/home/user/files/foo/bar"

addSlash :: Policy Source #

Add an initial slash to to the URI, if not already present.

staticPolicy addSlash

GET "foo/bar" looks for "/foo/bar"

contains :: String -> Policy Source #

Accept only URIs containing given string

hasPrefix :: String -> Policy Source #

Accept only URIs with given prefix

hasSuffix :: String -> Policy Source #

Accept only URIs with given suffix

noDots :: Policy Source #

Reject URIs containing ".."

isNotAbsolute :: Policy Source #

Reject URIs that are absolute paths

only :: [(String, String)] -> Policy Source #

Use URI as the key to an association list, rejecting those not found. The policy result is the matching value.

staticPolicy (only [("foo/bar", "/home/user/files/bar")])

GET "foo/bar" looks for "/home/user/files/bar" GET "baz/bar" doesn't match anything

Utilities

tryPolicy :: Policy -> String -> Maybe String Source #

Run a policy

MIME types

getMimeType :: FilePath -> MimeType Source #

Guess MIME type from file extension