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
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
package instance
import (
"context"
"fmt"
"net/http"
"time"
"git.sigsum.org/sigsum-go/pkg/log"
"git.sigsum.org/sigsum-go/pkg/types"
)
// Handler implements the http.Handler interface, and contains a reference
// to a sigsum server instance as well as a function that uses it.
type Handler struct {
Instance *Instance
Endpoint types.Endpoint
Method string
Handler func(context.Context, *Instance, http.ResponseWriter, *http.Request) (int, error)
}
// Path returns a path that should be configured for this handler
func (h Handler) Path() string {
if len(h.Instance.Prefix) == 0 {
return h.Endpoint.Path("", "sigsum", "v0")
}
return h.Endpoint.Path("", h.Instance.Prefix, "sigsum", "v0")
}
// ServeHTTP is part of the http.Handler interface
func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
start := time.Now()
code := 0
defer func() {
end := time.Now().Sub(start).Seconds()
sc := fmt.Sprintf("%d", code)
rspcnt.Inc(h.Instance.LogID, string(h.Endpoint), sc)
latency.Observe(end, h.Instance.LogID, string(h.Endpoint), sc)
}()
reqcnt.Inc(h.Instance.LogID, string(h.Endpoint))
code = h.verifyMethod(w, r)
if code != 0 {
return
}
code = h.handle(w, r)
}
// verifyMethod checks that an appropriate HTTP method is used. Error handling
// is based on RFC 7231, see Sections 6.5.5 (Status 405) and 6.5.1 (Status 400).
func (h *Handler) verifyMethod(w http.ResponseWriter, r *http.Request) int {
if h.Method == r.Method {
return 0
}
code := http.StatusBadRequest
if ok := h.Instance.checkHTTPMethod(r.Method); ok {
w.Header().Set("Allow", h.Method)
code = http.StatusMethodNotAllowed
}
http.Error(w, fmt.Sprintf("error=%s", http.StatusText(code)), code)
return code
}
// handle handles an HTTP request for which the HTTP method is already verified
func (h Handler) handle(w http.ResponseWriter, r *http.Request) int {
deadline := time.Now().Add(h.Instance.Deadline)
ctx, cancel := context.WithDeadline(r.Context(), deadline)
defer cancel()
code, err := h.Handler(ctx, h.Instance, w, r)
if err != nil {
log.Debug("%s/%s: %v", h.Instance.Prefix, h.Endpoint, err)
http.Error(w, fmt.Sprintf("error=%s", err.Error()), code)
}
return code
}
func addLeaf(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
log.Debug("handling add-leaf request")
req, err := i.leafRequestFromHTTP(ctx, r)
if err != nil {
return http.StatusBadRequest, err
}
if err := i.Client.AddLeaf(ctx, req); err != nil {
return http.StatusInternalServerError, err
}
return http.StatusOK, nil
}
func addCosignature(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
log.Debug("handling add-cosignature request")
req, err := i.cosignatureRequestFromHTTP(r)
if err != nil {
return http.StatusBadRequest, err
}
vk := i.Witnesses[req.KeyHash]
if err := i.Stateman.AddCosignature(ctx, &vk, &req.Cosignature); err != nil {
return http.StatusBadRequest, err
}
return http.StatusOK, nil
}
func getTreeHeadToCosign(ctx context.Context, i *Instance, w http.ResponseWriter, _ *http.Request) (int, error) {
log.Debug("handling get-tree-head-to-cosign request")
sth, err := i.Stateman.ToCosignTreeHead(ctx)
if err != nil {
return http.StatusInternalServerError, err
}
if err := sth.ToASCII(w); err != nil {
return http.StatusInternalServerError, err
}
return http.StatusOK, nil
}
func getTreeHeadCosigned(ctx context.Context, i *Instance, w http.ResponseWriter, _ *http.Request) (int, error) {
log.Debug("handling get-tree-head-cosigned request")
cth, err := i.Stateman.CosignedTreeHead(ctx)
if err != nil {
return http.StatusInternalServerError, err
}
if err := cth.ToASCII(w); err != nil {
return http.StatusInternalServerError, err
}
return http.StatusOK, nil
}
func getConsistencyProof(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
log.Debug("handling get-consistency-proof request")
req, err := i.consistencyProofRequestFromHTTP(r)
if err != nil {
return http.StatusBadRequest, err
}
// XXX: check tree size of latest thing we signed?
proof, err := i.Client.GetConsistencyProof(ctx, req)
if err != nil {
return http.StatusInternalServerError, err
}
if err := proof.ToASCII(w); err != nil {
return http.StatusInternalServerError, err
}
return http.StatusOK, nil
}
func getInclusionProof(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
log.Debug("handling get-inclusion-proof request")
req, err := i.inclusionProofRequestFromHTTP(r)
if err != nil {
return http.StatusBadRequest, err
}
// XXX: check tree size of latest thing we signed?
proof, err := i.Client.GetInclusionProof(ctx, req)
if err != nil {
return http.StatusInternalServerError, err
}
if err := proof.ToASCII(w); err != nil {
return http.StatusInternalServerError, err
}
return http.StatusOK, nil
}
func getLeaves(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
log.Debug("handling get-leaves request")
req, err := i.leavesRequestFromHTTP(r)
if err != nil {
return http.StatusBadRequest, err
}
// XXX: check tree size of latest thing we signed?
leaves, err := i.Client.GetLeaves(ctx, req)
if err != nil {
return http.StatusInternalServerError, err
}
for _, leaf := range *leaves {
if err := leaf.ToASCII(w); err != nil {
return http.StatusInternalServerError, err
}
}
return http.StatusOK, nil
}
|
