servant-dhall: Servant Dhall content-type
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Servant Dhall bindings.
Provides MimeRender and MimeUnrender instances.
So you can accept and return Dhall expressions.
Note: Reading (and evaluating) Dhall expressions from untrusted sources is a security risk.
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Properties
| Versions | 0.1, 0.1.0.1, 0.1.0.2, 0.3, 0.3 |
|---|---|
| Change log | CHANGELOG.md |
| Dependencies | base (>=4.9 && <4.14), base-compat (>=0.10.1 && <0.12), bytestring (>=0.10.4.0 && <0.11), dhall (>=1.29.0 && <1.30), either (>=5.0.1.1 && <5.1), http-media (>=0.7.1.2 && <0.9), megaparsec (>=7.0.4 && <8.1), prettyprinter (>=1.5.1 && <1.7), servant (>=0.17 && <0.18), text (>=1.2.3.0 && <1.3) [details] |
| License | BSD-3-Clause |
| Copyright | 2018-2019 Servant Contributors |
| Author | Servant Contributors |
| Maintainer | haskell-servant-maintainers@googlegroups.com |
| Category | Web, Servant, Dhall |
| Home page | http://haskell-servant.readthedocs.org/ |
| Bug tracker | http://github.com/haskell-servant/servant-dhall/issues |
| Source repo | head: git clone http://github.com/haskell-servant/servant-dhall.git |
| Uploaded | by phadej at 2020-01-24T10:49:17Z |
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- servant-dhall-0.3.tar.gz [browse] (Cabal source package)
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Readme for servant-dhall-0.3
[back to package description]servant-dhall - Servant Dhall bindings
Note: accepting dhall expressions from untrusted sources is a security risk.
Example
Run example
cabal new-run example run
Get
% curl 'localhost:8000/get'
[ +1, +2, +3, +4, +5, +6, +7, +8, +9, +10 ] : List Integer
Post
% curl -D - -X POST -H 'Content-Type: application/x-dhall' --data-raw '[+10,+20]' 'localhost:8000/post'
HTTP/1.1 200 OK
Transfer-Encoding: chunked
Date: Wed, 13 Jun 2018 10:41:07 GMT
Server: Warp/3.2.22
Content-Type: application/x-dhall
[ +11, +21 ] : List Integer
Error case: Unexpected type
% curl -D - -X POST -H 'Content-Type: application/x-dhall' --data-raw '[10]' 'localhost:8000/post'
curl: (7) Failed to connect to localhost port 8000: Connection refused
[FL973] ~/Documents/public-haskell/servant-dhall % curl -D - -X POST -H 'Content-Type: application/x-dhall' --data-raw '[10]' 'localhost:8000/post'
HTTP/1.1 400 Bad Request
Transfer-Encoding: chunked
Date: Wed, 13 Jun 2018 10:45:39 GMT
Server: Warp/3.2.22
Expected and actual types don't match : List Integer /= List Natural
Error case: Type error
% curl -D - -X POST -H 'Content-Type: application/x-dhall' --data-raw 'True && +1' 'localhost:8000/post'
HTTP/1.1 400 Bad Request
Transfer-Encoding: chunked
Date: Wed, 13 Jun 2018 10:51:52 GMT
Server: Warp/3.2.22
Type error:
Error: ❰&&❱ only works on ❰Bool❱s
True && +1
(input):1:1
Error case: Imports
As deserialisation is done in pure context type-checking Dhall expressions with imports is not possible.
% curl -D - -X POST -H 'Content-Type: application/x-dhall' --data-raw 'http://example.com/dhall' 'localhost:8000/post'
HTTP/1.1 400 Bad Request
Transfer-Encoding: chunked
Date: Wed, 13 Jun 2018 10:53:52 GMT
Server: Warp/3.2.22
Import found: http://example.com/dhall