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tangled.org
1package pages
2
3import (
4 "crypto/hmac"
5 "crypto/sha256"
6 "encoding/hex"
7 "errors"
8 "fmt"
9 "html"
10 "html/template"
11 "log"
12 "math"
13 "net/url"
14 "path/filepath"
15 "reflect"
16 "strings"
17 "time"
18
19 "github.com/dustin/go-humanize"
20 "github.com/microcosm-cc/bluemonday"
21 "tangled.sh/tangled.sh/core/appview/filetree"
22 "tangled.sh/tangled.sh/core/appview/pages/markup"
23)
24
25func (p *Pages) funcMap() template.FuncMap {
26 return template.FuncMap{
27 "split": func(s string) []string {
28 return strings.Split(s, "\n")
29 },
30 "truncateAt30": func(s string) string {
31 if len(s) <= 30 {
32 return s
33 }
34 return s[:30] + "…"
35 },
36 "splitOn": func(s, sep string) []string {
37 return strings.Split(s, sep)
38 },
39 "int64": func(a int) int64 {
40 return int64(a)
41 },
42 "add": func(a, b int) int {
43 return a + b
44 },
45 "now": func() time.Time {
46 return time.Now()
47 },
48 // the absolute state of go templates
49 "add64": func(a, b int64) int64 {
50 return a + b
51 },
52 "sub": func(a, b int) int {
53 return a - b
54 },
55 "f64": func(a int) float64 {
56 return float64(a)
57 },
58 "addf64": func(a, b float64) float64 {
59 return a + b
60 },
61 "subf64": func(a, b float64) float64 {
62 return a - b
63 },
64 "mulf64": func(a, b float64) float64 {
65 return a * b
66 },
67 "divf64": func(a, b float64) float64 {
68 if b == 0 {
69 return 0
70 }
71 return a / b
72 },
73 "negf64": func(a float64) float64 {
74 return -a
75 },
76 "cond": func(cond interface{}, a, b string) string {
77 if cond == nil {
78 return b
79 }
80
81 if boolean, ok := cond.(bool); boolean && ok {
82 return a
83 }
84
85 return b
86 },
87 "didOrHandle": func(did, handle string) string {
88 if handle != "" {
89 return fmt.Sprintf("@%s", handle)
90 } else {
91 return did
92 }
93 },
94 "assoc": func(values ...string) ([][]string, error) {
95 if len(values)%2 != 0 {
96 return nil, fmt.Errorf("invalid assoc call, must have an even number of arguments")
97 }
98 pairs := make([][]string, 0)
99 for i := 0; i < len(values); i += 2 {
100 pairs = append(pairs, []string{values[i], values[i+1]})
101 }
102 return pairs, nil
103 },
104 "append": func(s []string, values ...string) []string {
105 s = append(s, values...)
106 return s
107 },
108 "timeFmt": humanize.Time,
109 "longTimeFmt": func(t time.Time) string {
110 return t.Format("Jan 2, 2006, 3:04 PM MST")
111 },
112 "iso8601Fmt": func(t time.Time) string {
113 return t.Format("2006-01-02T15:04:05-07:00")
114 },
115 "commaFmt": humanize.Comma,
116 "shortTimeFmt": func(t time.Time) string {
117 return humanize.CustomRelTime(t, time.Now(), "", "", []humanize.RelTimeMagnitude{
118 {time.Second, "now", time.Second},
119 {2 * time.Second, "1s %s", 1},
120 {time.Minute, "%ds %s", time.Second},
121 {2 * time.Minute, "1min %s", 1},
122 {time.Hour, "%dmin %s", time.Minute},
123 {2 * time.Hour, "1hr %s", 1},
124 {humanize.Day, "%dhrs %s", time.Hour},
125 {2 * humanize.Day, "1d %s", 1},
126 {20 * humanize.Day, "%dd %s", humanize.Day},
127 {8 * humanize.Week, "%dw %s", humanize.Week},
128 {humanize.Year, "%dmo %s", humanize.Month},
129 {18 * humanize.Month, "1y %s", 1},
130 {2 * humanize.Year, "2y %s", 1},
131 {humanize.LongTime, "%dy %s", humanize.Year},
132 {math.MaxInt64, "a long while %s", 1},
133 })
134 },
135 "durationFmt": func(duration time.Duration) string {
136 days := int64(duration.Hours() / 24)
137 hours := int64(math.Mod(duration.Hours(), 24))
138 minutes := int64(math.Mod(duration.Minutes(), 60))
139 seconds := int64(math.Mod(duration.Seconds(), 60))
140
141 chunks := []struct {
142 name string
143 amount int64
144 }{
145 {"d", days},
146 {"hr", hours},
147 {"min", minutes},
148 {"s", seconds},
149 }
150
151 parts := []string{}
152
153 for _, chunk := range chunks {
154 if chunk.amount != 0 {
155 parts = append(parts, fmt.Sprintf("%d%s", chunk.amount, chunk.name))
156 }
157 }
158
159 return strings.Join(parts, " ")
160 },
161 "byteFmt": humanize.Bytes,
162 "length": func(slice any) int {
163 v := reflect.ValueOf(slice)
164 if v.Kind() == reflect.Slice || v.Kind() == reflect.Array {
165 return v.Len()
166 }
167 return 0
168 },
169 "splitN": func(s, sep string, n int) []string {
170 return strings.SplitN(s, sep, n)
171 },
172 "escapeHtml": func(s string) template.HTML {
173 if s == "" {
174 return template.HTML("<br>")
175 }
176 return template.HTML(s)
177 },
178 "unescapeHtml": func(s string) string {
179 return html.UnescapeString(s)
180 },
181 "nl2br": func(text string) template.HTML {
182 return template.HTML(strings.Replace(template.HTMLEscapeString(text), "\n", "<br>", -1))
183 },
184 "unwrapText": func(text string) string {
185 paragraphs := strings.Split(text, "\n\n")
186
187 for i, p := range paragraphs {
188 lines := strings.Split(p, "\n")
189 paragraphs[i] = strings.Join(lines, " ")
190 }
191
192 return strings.Join(paragraphs, "\n\n")
193 },
194 "sequence": func(n int) []struct{} {
195 return make([]struct{}, n)
196 },
197 // take atmost N items from this slice
198 "take": func(slice any, n int) any {
199 v := reflect.ValueOf(slice)
200 if v.Kind() != reflect.Slice && v.Kind() != reflect.Array {
201 return nil
202 }
203 if v.Len() == 0 {
204 return nil
205 }
206 return v.Slice(0, min(n, v.Len()-1)).Interface()
207 },
208
209 "markdown": func(text string) template.HTML {
210 rctx := &markup.RenderContext{RendererType: markup.RendererTypeDefault}
211 return template.HTML(bluemonday.UGCPolicy().Sanitize(rctx.RenderMarkdown(text)))
212 },
213 "isNil": func(t any) bool {
214 // returns false for other "zero" values
215 return t == nil
216 },
217 "list": func(args ...any) []any {
218 return args
219 },
220 "dict": func(values ...any) (map[string]any, error) {
221 if len(values)%2 != 0 {
222 return nil, errors.New("invalid dict call")
223 }
224 dict := make(map[string]any, len(values)/2)
225 for i := 0; i < len(values); i += 2 {
226 key, ok := values[i].(string)
227 if !ok {
228 return nil, errors.New("dict keys must be strings")
229 }
230 dict[key] = values[i+1]
231 }
232 return dict, nil
233 },
234 "deref": func(v any) any {
235 val := reflect.ValueOf(v)
236 if val.Kind() == reflect.Ptr && !val.IsNil() {
237 return val.Elem().Interface()
238 }
239 return nil
240 },
241 "i": func(name string, classes ...string) template.HTML {
242 data, err := icon(name, classes)
243 if err != nil {
244 log.Printf("icon %s does not exist", name)
245 data, _ = icon("airplay", classes)
246 }
247 return template.HTML(data)
248 },
249 "cssContentHash": CssContentHash,
250 "fileTree": filetree.FileTree,
251 "pathUnescape": func(s string) string {
252 u, _ := url.PathUnescape(s)
253 return u
254 },
255
256 "tinyAvatar": p.tinyAvatar,
257 }
258}
259
260func (p *Pages) tinyAvatar(handle string) string {
261 handle = strings.TrimPrefix(handle, "@")
262 secret := p.avatar.SharedSecret
263 h := hmac.New(sha256.New, []byte(secret))
264 h.Write([]byte(handle))
265 signature := hex.EncodeToString(h.Sum(nil))
266 return fmt.Sprintf("%s/%s/%s?size=tiny", p.avatar.Host, signature, handle)
267}
268
269func icon(name string, classes []string) (template.HTML, error) {
270 iconPath := filepath.Join("static", "icons", name)
271
272 if filepath.Ext(name) == "" {
273 iconPath += ".svg"
274 }
275
276 data, err := Files.ReadFile(iconPath)
277 if err != nil {
278 return "", fmt.Errorf("icon %s not found: %w", name, err)
279 }
280
281 // Convert SVG data to string
282 svgStr := string(data)
283
284 svgTagEnd := strings.Index(svgStr, ">")
285 if svgTagEnd == -1 {
286 return "", fmt.Errorf("invalid SVG format for icon %s", name)
287 }
288
289 classTag := ` class="` + strings.Join(classes, " ") + `"`
290
291 modifiedSVG := svgStr[:svgTagEnd] + classTag + svgStr[svgTagEnd:]
292 return template.HTML(modifiedSVG), nil
293}