Begin implementation on apiv1.
Begin implementing the apiv1 package, which will define the first iteration of
our API endpoints and logic. Each API package should be self-contained and able
to run without depending on each other. Think of them as interfaces into
manipulating the business logic defined in the devices package. The point is to
have total control over backwards compatibility, as long as our business logic
doesn't change. If that happens, we're in a bad place, but not as bad as it
could be.
This required us to pull in all our API tools; the api package, its
dependencies, the scopeTypes package (so we can define scopes for our API), the
trout router, etc. We also updated uuid to the latest, which now includes a
license. Hooray?
The new apiv1 package consists of a few things:
* The devices.go file defines the types the API will use to communicate, along
with some helpers to convert from API types to devices types. There's also a
stub for validating the device creation requests, which I haven't implemented
yet because I'm a pretty bad person.
* endpoints.go just contains a helper function that builds our routes and
assigns handlers to them, giving us an http.Handler in the returns that we can
listen with.
* handlers.go defines our HTTP handlers, which will read requests and write
responses, after doing the appropriate validation and executing the
appropriating business logic. Right now, we only have a handler for creating
devices, and it doesn't actually do any validation. Also, we have some
user-correctable errors being returned as 500s right now, which is Bad.
Fortunately, they're all marked with BUG, so I can at least come back to them.
* response.go defines the Response type that will be used for returning
information after a request is executed. It may eventually get some helpers,
but for now it's pretty basic.
* scopes.go defines the Scopes that we're going to be using in the package to
control access. It should probably (eventually) include a helper to register
the Scopes, or we should have a collector service that pulls in all the
packages, finds all their Scopes, and registers them. I haven't decided how I
want to manage Scope registration just yet.
We exported the getStorer function (now GetStorer) so other packages can use it.
I'm not sure how I feel about this just yet. We also had to create a WithStorer
helper method that embeds the Storer into a context.Context, so we can bootstrap
in devicesd.
We erroneously had Created in the DeviceChange struct, but there's no reason the
Created property of a Device should ever change, so it was removed from the
logic, from the struct, and from the tests.
Our CreateMany helper was erroneously creating the un-modified Devices that were
passed in, instead of the Devices that had sensible defaults filled.
We created a _very minimal_ (e.g., needs some work before it's ready for
production) devicesd package that will spin up a simple server, just so we could
take a peek at our apiv1 endpoints as they'd actually be used. (It worked. Yay?)
We should continue to expand on this with configuration, more information being
logged, etc.
2 HTTP Content-Type Autonegotiation.
4 The functions in this package implement the behaviour specified in
5 http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
7 Copyright (c) 2011, Open Knowledge Foundation Ltd.
10 Redistribution and use in source and binary forms, with or without
11 modification, are permitted provided that the following conditions are
14 Redistributions of source code must retain the above copyright
15 notice, this list of conditions and the following disclaimer.
17 Redistributions in binary form must reproduce the above copyright
18 notice, this list of conditions and the following disclaimer in
19 the documentation and/or other materials provided with the
22 Neither the name of the Open Knowledge Foundation Ltd. nor the
23 names of its contributors may be used to endorse or promote
24 products derived from this software without specific prior written
27 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
30 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31 HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
49 // Structure to represent a clause in an HTTP Accept Header
53 Params map[string]string
56 // For internal use, so that we can use the sort interface
57 type accept_slice []Accept
59 func (accept accept_slice) Len() int {
60 slice := []Accept(accept)
64 func (accept accept_slice) Less(i, j int) bool {
65 slice := []Accept(accept)
66 ai, aj := slice[i], slice[j]
70 if ai.Type != "*" && aj.Type == "*" {
73 if ai.SubType != "*" && aj.SubType == "*" {
79 func (accept accept_slice) Swap(i, j int) {
80 slice := []Accept(accept)
81 slice[i], slice[j] = slice[j], slice[i]
84 // Parse an Accept Header string returning a sorted list
86 func ParseAccept(header string) (accept []Accept) {
87 parts := strings.Split(header, ",")
88 accept = make([]Accept, 0, len(parts))
89 for _, part := range parts {
90 part := strings.Trim(part, " ")
93 a.Params = make(map[string]string)
96 mrp := strings.Split(part, ";")
99 sp := strings.Split(media_range, "/")
100 a.Type = strings.Trim(sp[0], " ")
103 case len(sp) == 1 && a.Type == "*":
106 a.SubType = strings.Trim(sp[1], " ")
112 accept = append(accept, a)
116 for _, param := range mrp[1:] {
117 sp := strings.SplitN(param, "=", 2)
121 token := strings.Trim(sp[0], " ")
123 a.Q, _ = strconv.ParseFloat(sp[1], 32)
125 a.Params[token] = strings.Trim(sp[1], " ")
129 accept = append(accept, a)
132 slice := accept_slice(accept)
138 // Negotiate the most appropriate content_type given the accept header
139 // and a list of alternatives.
140 func Negotiate(header string, alternatives []string) (content_type string) {
141 asp := make([][]string, 0, len(alternatives))
142 for _, ctype := range alternatives {
143 asp = append(asp, strings.SplitN(ctype, "/", 2))
145 for _, clause := range ParseAccept(header) {
146 for i, ctsp := range asp {
147 if clause.Type == ctsp[0] && clause.SubType == ctsp[1] {
148 content_type = alternatives[i]
151 if clause.Type == ctsp[0] && clause.SubType == "*" {
152 content_type = alternatives[i]
155 if clause.Type == "*" && clause.SubType == "*" {
156 content_type = alternatives[i]