api_v1.nim
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 |
import asynchttpserver, asyncdispatch, strutils, cgi, strtabs, pegs
import types, core, utils
# Helper procs
proc orderByClause(clause: string): string =
var matches = @["", ""]
if clause.find(peg"{[-+ ]} {(id / created / modified)}", matches) != -1:
if matches[0] == "-":
return "$1 DESC" % matches[1]
else:
return "$1 ASC" % matches[1]
else:
return ""
proc parseQueryOption(fragment: string, options: var QueryOptions) =
var pair = fragment.split('=')
if pair.len < 2 or pair[1] == "":
raise newException(EInvalidRequest, "Invalid query string fragment '$1'" % fragment)
try:
pair[1] = pair[1].decodeURL
except:
raise newException(EInvalidRequest, "Unable to decode query string fragment '$1'" % fragment)
case pair[0]:
of "search":
options.search = pair[1]
of "tags":
options.tags = pair[1]
of "limit":
try:
options.limit = pair[1].parseInt
except:
raise newException(EInvalidRequest, "Invalid limit value: $1" % getCurrentExceptionMsg())
of "sort":
let orderby = pair[1].orderByClause()
if orderby != "":
options.orderby = orderby
else:
raise newException(EInvalidRequest, "Invalid sort value: $1" % pair[1])
else:
return
proc parseQueryOptions(querystring: string, options: var QueryOptions) =
var fragments = querystring.split('&')
for f in fragments:
f.parseQueryOption(options)
# Low level procs
proc getRawDocument(LS: LiteStore, id: string, options = newQueryOptions()): Response =
let doc = LS.store.retrieveRawDocument(id, options)
result.headers = ctJsonHeader()
if doc == "":
result = resDocumentNotFound(id)
else:
result.content = doc
result.code = Http200
proc getDocument(LS: LiteStore, id: string, options = newQueryOptions()): Response =
let doc = LS.store.retrieveDocument(id, options)
if doc.data == "":
result = resDocumentNotFound(id)
else:
result.headers = doc.contenttype.ctHeader
result.content = doc.data
result.code = Http200
proc getRawDocuments(LS: LiteStore, options = newQueryOptions()): Response =
let docs = LS.store.retrieveRawDocuments(options)
if docs == "[]":
result = resError(Http404, "No documents found.")
else:
result.headers = ctJsonHeader()
result.content = docs
result.code = Http200
# Main routing
proc options(req: Request, LS: LiteStore, id = ""): Response =
if id != "":
result.code = Http202
result.content = ""
result.headers = {"Allow": "HEAD,GET,PUT,PATCH,DELETE"}.newStringTable
else:
result.code = Http202
result.content = ""
result.headers = {"Allow": "HEAD,GET,POST,DELETE"}.newStringTable
proc head(req: Request, LS: LiteStore, id = ""): Response =
var options = newQueryOptions()
options.select = "id, content_type, binary, searchable, created, modified"
try:
parseQueryOptions(req.url.query, options);
if id != "":
return LS.getRawDocument(id, options)
else:
return LS.getRawDocuments(options)
except:
return resError(Http400, "Bad request - $1" % getCurrentExceptionMsg())
proc get(req: Request, LS: LiteStore, id = ""): Response =
var options = newQueryOptions()
try:
parseQueryOptions(req.url.query, options);
if id != "":
if req.url.query.contains("raw=true") or req.headers["Content-Type"] == "application/json":
return LS.getRawDocument(id, options)
else:
return LS.getDocument(id, options)
else:
return LS.getRawDocuments(options)
except:
return resError(Http400, "Bad request - $1" % getCurrentExceptionMsg())
proc route*(req: Request, LS: LiteStore, id = ""): Response =
case req.reqMethod:
of "HEAD":
return req.head(LS, id)
of "OPTIONS":
return req.options(LS, id)
of "GET":
return req.get(LS, id)
else:
return resError(Http405, "Method not allowed: $1" % req.reqMethod)
|