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annotate mrjunejune/template_renderer.c @ 279:b3b547563ec7

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Add Google connector service and agent wiki Implement the C/Seobeo Google Drive and Gmail connector with encrypted OAuth storage, Zenbu authentication, browser testing, AI tool discovery, chunked HTTP decoding, and Bazel coverage. Consolidate repository guidance into progressive wiki documentation and enforce arena-first allocation for new first-party C code. Co-authored-by: Copilot <[email protected]> Copilot-Session: 84c338fd-0939-4bb3-b7f3-1062eb213e5d
author MrJuneJune <me@mrjunejune.com>
date Mon, 17 Aug 2026 22:22:36 -0700
parents 04fee26ecce0
children
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1 /*
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2 * template_renderer.c — site-owned HTML template renderer for mrjunejune.
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3 *
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4 * Expands one level of {{/path}} include tokens found in HTML templates.
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5 * File I/O is done with standard C fopen/fread so that tests can point
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6 * the renderer at any root without depending on Seobeo server state.
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7 */
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8
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9 #include "mrjunejune/template_renderer.h"
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10
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11 #include "dowa/dowa.h"
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12 #include "seobeo/seobeo.h"
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13
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14 #include <stdio.h>
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15 #include <stdlib.h>
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16 #include <string.h>
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17
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18 /* Default matches the path Seobeo_Web_Server_Start_On receives in main.c. */
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19 static char g_src_root[512] = "mrjunejune/src";
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20
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21 void Mjj_Template_Renderer_Init(const char *src_root)
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22 {
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23 if (!src_root || src_root[0] == '\0')
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24 return;
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25 strncpy(g_src_root, src_root, sizeof(g_src_root) - 1);
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26 g_src_root[sizeof(g_src_root) - 1] = '\0';
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27 }
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28
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29 /* Load a file using the renderer's own root; caller must free() result. */
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30 static char *renderer_load_file(const char *rel_path, size_t *p_size)
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31 {
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32 if (!rel_path)
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33 return NULL;
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34
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35 char full_path[1024];
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36 /* rel_path already starts with '/' when produced by canonical markers
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37 (e.g. "/parts/base_head.html"), so concatenate directly. */
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38 if (rel_path[0] == '/')
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39 snprintf(full_path, sizeof(full_path), "%s%s", g_src_root, rel_path);
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40 else
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41 snprintf(full_path, sizeof(full_path), "%s/%s", g_src_root, rel_path);
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42
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43 FILE *f = fopen(full_path, "rb");
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44 if (!f)
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45 return NULL;
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46
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47 fseek(f, 0, SEEK_END);
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48 long sz = ftell(f);
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49 fseek(f, 0, SEEK_SET);
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50 if (sz < 0)
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51 {
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52 fclose(f);
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53 return NULL;
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54 }
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55
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56 char *buf = (char *)malloc((size_t)sz + 1);
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57 if (!buf)
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58 {
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59 fclose(f);
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60 return NULL;
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61 }
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62
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63 size_t n = fread(buf, 1, (size_t)sz, f);
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64 fclose(f);
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65 buf[n] = '\0';
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66
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67 if (p_size)
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68 *p_size = n;
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69 return buf;
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70 }
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71
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72 /* Write `len` bytes of `src` to out starting at *p_offset, respecting cap.
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73 Returns FALSE and does a best-effort NUL-terminate on overflow. */
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74 static boolean safe_append(
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75 char *out, size_t cap, size_t *p_offset,
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76 const char *src, size_t len)
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77 {
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78 if (len == 0)
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79 return TRUE;
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80 if (*p_offset + len >= cap)
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81 {
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82 /* Partial write then NUL-terminate. */
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83 size_t avail = (cap > *p_offset + 1) ? (cap - *p_offset - 1) : 0;
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84 if (avail > 0)
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85 memcpy(out + *p_offset, src, avail);
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86 out[cap - 1] = '\0';
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87 return FALSE;
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88 }
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89 memcpy(out + *p_offset, src, len);
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90 *p_offset += len;
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91 return TRUE;
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92 }
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93
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94 boolean Mjj_Template_Render(
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95 char *out, size_t cap, const char *tmpl, Dowa_Arena *arena)
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96 {
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97 if (!out || cap == 0)
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98 return FALSE;
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99 out[0] = '\0';
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100 if (!tmpl)
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101 return FALSE;
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102
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103 size_t offset = 0;
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104 const char *cursor = tmpl;
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105
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106 while (1)
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107 {
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108 const char *open = strstr(cursor, "{{");
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109 if (!open)
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110 break;
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111
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112 const char *close = strstr(open + 2, "}}");
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113 if (!close)
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114 break;
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115
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116 /* Copy text before the token. */
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117 size_t lead = (size_t)(open - cursor);
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118 if (!safe_append(out, cap, &offset, cursor, lead))
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119 return FALSE;
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120
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121 /* Extract include path between {{ and }}. */
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122 size_t name_len = (size_t)(close - (open + 2));
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123 char *include_name = (char *)Dowa_Arena_Allocate(arena, name_len + 1);
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124 if (!include_name)
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125 return FALSE;
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126 memcpy(include_name, open + 2, name_len);
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127 include_name[name_len] = '\0';
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128
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129 /* Load and inline the included file; skip silently if missing. */
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130 size_t inc_size = 0;
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131 char *inc = renderer_load_file(include_name, &inc_size);
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132 Seobeo_Log(SEOBEO_DEBUG,
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133 "[TEMPLATE] include '%s' -> %s (size=%zu)\n",
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134 include_name, inc ? "OK" : "MISSING", inc_size);
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135 if (inc)
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136 {
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137 boolean ok = safe_append(out, cap, &offset, inc, inc_size);
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138 free(inc);
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139 if (!ok)
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140 return FALSE;
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141 }
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142
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143 cursor = close + 2;
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144 }
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145
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146 /* Copy the tail (after the last token, or the whole string if no tokens). */
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147 size_t tail = strlen(cursor);
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148 if (!safe_append(out, cap, &offset, cursor, tail))
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149 return FALSE;
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150
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151 out[offset] = '\0';
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152 return TRUE;
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153 }
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154
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155 boolean Mjj_Template_Render_File(
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156 char *out, size_t cap, const char *path, Dowa_Arena *arena)
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157 {
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158 if (!out || cap == 0)
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159 return FALSE;
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160 out[0] = '\0';
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161
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162 Seobeo_Log(SEOBEO_DEBUG, "[TEMPLATE] loading file '%s'\n", path);
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163
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164 size_t file_size = 0;
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165 char *tmpl = renderer_load_file(path, &file_size);
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166 if (!tmpl)
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167 {
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168 Seobeo_Log(SEOBEO_DEBUG, "[TEMPLATE] file '%s' not found\n", path);
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169 return FALSE;
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170 }
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171
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172 boolean ok = Mjj_Template_Render(out, cap, tmpl, arena);
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173 free(tmpl);
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174 return ok;
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175 }