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/* test_image.c - 图片格式嗅探、本地备份、base64、请求前展开 */
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#include "image.h"
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#include "util.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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static int failures = 0;
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static int checks = 0;
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#define CHECK(cond, ...) \
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do { \
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checks++; \
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if (!(cond)) { \
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failures++; \
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printf(" ✗ %s:%d: ", __FILE__, __LINE__); \
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printf(__VA_ARGS__); \
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printf("\n"); \
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} \
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} while (0)
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static const char PNG[] = "\x89PNG\r\n\x1a\n rest";
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static const char JPEG[] = "\xff\xd8\xff\xe0 rest";
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static const char GIF87[] = "GIF87a rest";
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static const char GIF89[] = "GIF89a rest";
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static const char WEBP[] = "RIFF\x00\x00\x00\x00WEBPVP8 ";
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static void test_sniff(void)
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{
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puts("按文件内容认格式（不看扩展名）");
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const char *ext = NULL, *mime = NULL;
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CHECK(image_sniff((const unsigned char *)PNG, 14, &ext, &mime) == 0 &&
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strcmp(ext, "png") == 0 && strcmp(mime, "image/png") == 0, "PNG");
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CHECK(image_sniff((const unsigned char *)JPEG, 7, &ext, &mime) == 0 &&
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strcmp(ext, "jpg") == 0 && strcmp(mime, "image/jpeg") == 0, "JPEG");
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CHECK(image_sniff((const unsigned char *)GIF87, 10, &ext, &mime) == 0 &&
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strcmp(ext, "gif") == 0, "GIF87a");
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CHECK(image_sniff((const unsigned char *)GIF89, 10, &ext, &mime) == 0 &&
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strcmp(ext, "gif") == 0, "GIF89a");
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CHECK(image_sniff((const unsigned char *)WEBP, 16, &ext, &mime) == 0 &&
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strcmp(ext, "webp") == 0 && strcmp(mime, "image/webp") == 0, "WebP");
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/* 认不出来要明确失败，别猜一个格式报上去 */
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CHECK(image_sniff((const unsigned char *)"not an image", 12, &ext, &mime) != 0,
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"杂文本不该被认成图片");
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CHECK(image_sniff((const unsigned char *)"\x89PNG", 4, &ext, &mime) != 0,
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"截断的 PNG 头不该被认出来");
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CHECK(image_sniff((const unsigned char *)"RIFFxxxxNOPE", 12, &ext, &mime) != 0,
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"RIFF 但不是 WEBP 不该被认成 WebP");
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CHECK(image_sniff(NULL, 0, &ext, &mime) != 0, "NULL 不该崩");
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}
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static void test_backup(void)
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{
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puts("本地备份：命名、内容、不重复");
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char tmpl[] = "/tmp/ligent_img_XXXXXX";
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char *dir = mkdtemp(tmpl);
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CHECK(dir != NULL, "建临时目录失败");
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if (!dir) return;
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const unsigned char data[] = "\x89PNG\r\n\x1a\n payload";
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size_t n = sizeof data - 1;
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char *b1 = image_backup_save(dir, data, n, "png");
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CHECK(b1 != NULL, "备份应成功");
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if (!b1) { return; }
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/* 名字形如 <上传时间戳>_<4位随机>.<ext> */
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CHECK(strlen(b1) > 5, "名字不该太短：%s", b1);
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char *dot = strrchr(b1, '.');
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CHECK(dot && strcmp(dot, ".png") == 0, "扩展名应从嗅探结果来：%s", b1);
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CHECK(dot - b1 >= 7, "时间戳 + 下划线 + 4 位随机：%s", b1);
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CHECK(b1[dot - b1 - 5] == '_', "下划线位置应在随机后缀前：%s", b1);
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char *p1 = image_backup_path(dir, b1);
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size_t len = 0;
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char *back = read_entire_file(p1, &len);
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CHECK(back && len == n && memcmp(back, data, n) == 0, "备份内容应逐字节一致");
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free(back); free(p1);
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/* 再存一次应该拿到不同的名字（随机后缀），而不是互相覆盖 */
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char *b2 = image_backup_save(dir, data, n, "png");
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CHECK(b2 && strcmp(b1, b2) != 0, "两次备份不该同号：%s / %s",
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b1, b2 ? b2 : "(null)");
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free(b2);
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free(b1);
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/* 清场 */
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char *cmd = xasprintf("rm -rf %s", dir);
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if (system(cmd) != 0) { /* 清理失败不影响断言 */ }
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free(cmd);
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}
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static void test_base64(void)
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{
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puts("base64：长度、补位、往返");
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/* 用几组长度覆盖三种补位情况：3n、3n+1、3n+2 */
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struct { const char *in; const char *want; } cases[] = {
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{ "", "" },
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{ "f", "Zg==" },
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{ "fo", "Zm8=" },
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{ "foo", "Zm9v" },
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{ "foob", "Zm9vYg==" },
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{ "fooba", "Zm9vYmE=" },
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{ "foobar", "Zm9vYmFy" },
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};
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for (size_t i = 0; i < sizeof cases / sizeof cases[0]; i++) {
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size_t n = strlen(cases[i].in);
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char *got = base64_encode((const unsigned char *)cases[i].in, n);
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CHECK(got && strcmp(got, cases[i].want) == 0,
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"\"%s\" 应编码成 %s，实际 %s", cases[i].in, cases[i].want,
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got ? got : "(null)");
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CHECK(base64_encoded_len(n) == strlen(cases[i].want),
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"长度函数应与实际一致（%zu）", n);
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free(got);
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}
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/* 二进制字节（0x00 / 0xFF 这类不能被当字符串处理） */
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const unsigned char bin[] = { 0x00, 0xFF, 0x10, 0x80 };
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char *b = base64_encode(bin, sizeof bin);
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CHECK(b && strcmp(b, "AP8QgA==") == 0, "二进制应正确编码，实际 %s",
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b ? b : "(null)");
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free(b);
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}
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/* 造一张内容合法（靠文件头就能嗅探出来）的假图，返回字节数 */
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static size_t fake_png(unsigned char *out, size_t n)
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{
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static const char magic[] = "\x89PNG\r\n\x1a\n";
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size_t m = sizeof magic - 1;
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if (n < m) return 0;
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memcpy(out, magic, m);
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for (size_t i = m; i < n; i++) out[i] = (unsigned char)(i & 0xFF);
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return n;
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}
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/* 把一段备份引用塞进一条 user 消息，模拟 read_image 之后的历史 */
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static const char *ref_message_type = "ligent_image";
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static JsonValue *history_with_ref(const char *backup)
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{
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JsonValue *msgs = json_new_array();
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JsonValue *sys = json_new_object();
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json_object_set_string(sys, "role", "system");
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json_object_set_string(sys, "content", "你是助手");
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json_array_push(msgs, sys);
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JsonValue *part = json_new_object();
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json_object_set_string(part, "type", ref_message_type);
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json_object_set_string(part, "backup", backup);
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JsonValue *content = json_new_array();
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json_array_push(content, part);
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JsonValue *um = json_new_object();
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json_object_set_string(um, "role", "user");
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json_object_set(um, "content", content);
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json_array_push(msgs, um);
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return msgs;
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}
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static void test_expand(void)
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{
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puts("请求前展开：引用 -> image_url + base64");
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char tmpl[] = "/tmp/ligent_imgx_XXXXXX";
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char *dir = mkdtemp(tmpl);
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CHECK(dir != NULL, "建临时目录失败");
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if (!dir) return;
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image_set_bindir(dir);
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unsigned char png[256];
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size_t n = fake_png(png, sizeof png);
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char *backup = image_backup_save(dir, png, n, "png");
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CHECK(backup != NULL, "备份应成功");
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if (!backup) { image_set_bindir("."); return; }
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/* --- 正常展开 --- */
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JsonValue *msgs = history_with_ref(backup);
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int degraded = -1;
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JsonValue *wire = image_expand_for_request(msgs, °raded);
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CHECK(wire && json_array_size(wire) == 2, "副本消息条数应与原历史一致");
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CHECK(degraded == 0, "正常展开不该有降级");
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JsonValue *wu = json_array_get(wire, 1);
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JsonValue *wc = json_object_get(wu, "content");
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CHECK(wc && wc->type == JSON_ARRAY && json_array_size(wc) == 1,
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"附件消息应有一个 content 块");
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JsonValue *wp = json_array_get(wc, 0);
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CHECK(strcmp(json_get_string(wp, "type"), "image_url") == 0,
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"发送形态的类型应是 image_url，实际 %s",
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json_get_string(wp, "type"));
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JsonValue *iu = json_object_get(wp, "image_url");
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const char *url = iu ? json_get_string(iu, "url") : NULL;
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CHECK(url && strncmp(url, "data:image/png;base64,", 22) == 0,
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"应是 data: URL，实际 %.40s", url ? url : "(null)");
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/* base64 段应能解回原字节 —— 这里只验长度与首尾，避免在测试里再写一个解码器 */
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CHECK(url && strlen(url) == 22 + base64_encoded_len(n),
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"data URL 长度应等于前缀 + base64 长度");
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/* 关键不变量：原始历史没被改动，且里面没有图片字节 */
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char *orig = json_dump(msgs);
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CHECK(strstr(orig, "ligent_image") != NULL, "原历史里应还是引用");
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CHECK(strstr(orig, "base64") == NULL, "原历史里不该出现 base64");
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CHECK(strstr(orig, backup) != NULL, "原历史里应记着备份名");
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free(orig);
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json_free(wire);
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/* --- 备份没了：就地降级 --- */
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char *bpath = image_backup_path(dir, backup);
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CHECK(unlink(bpath) == 0, "删掉备份文件");
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free(bpath);
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degraded = 0;
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wire = image_expand_for_request(msgs, °raded);
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CHECK(degraded == 1, "读不到备份应降级 1 处");
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JsonValue *wc2 = json_object_get(json_array_get(wire, 1), "content");
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JsonValue *wp2 = json_array_get(wc2, 0);
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CHECK(strcmp(json_get_string(wp2, "type"), "text") == 0,
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"发送形态应降级成 text 块");
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const char *dt = json_get_string(wp2, "text");
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CHECK(dt && strstr(dt, "无法交给模型") != NULL, "应说明原因，实际 %s",
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dt ? dt : "(null)");
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json_free(wire);
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/* 降级是**就地**的：原历史里的坏引用应该已经被换掉，否则每轮都会重试 */
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char *after = json_dump(msgs);
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CHECK(strstr(after, "ligent_image") == NULL, "原历史里的坏引用应已被清掉");
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CHECK(strstr(after, "ligent_note") != NULL, "应换成内部说明块");
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free(after);
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/* 再来一次不该重复降级（历史已经干净了） */
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degraded = 0;
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wire = image_expand_for_request(msgs, °raded);
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CHECK(degraded == 0, "第二次不该再降级");
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json_free(wire);
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/* image_has_refs：降级之后应为 0，这正是 4xx 兜底的判据 */
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CHECK(image_has_refs(msgs) == 0, "降级后历史里不该还有图片引用");
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json_free(msgs);
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/* --- 4xx 兜底：image_degrade_all --- */
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JsonValue *m2 = history_with_ref(backup);
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CHECK(image_has_refs(m2) == 1, "有引用时应报 1");
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int dn = image_degrade_all(m2);
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CHECK(dn == 1, "应降级 1 处，实际 %d", dn);
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CHECK(image_has_refs(m2) == 0, "降级后不该还有引用");
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JsonValue *c2 = json_object_get(json_array_get(m2, 1), "content");
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const char *t2 = json_get_string(json_array_get(c2, 0), "text");
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/* 给模型的话必须是能直接照做的中文，而不是服务端的英文报错 */
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CHECK(t2 && strstr(t2, "不符合 API 所需的格式标准") != NULL,
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"应说明格式不符，实际 %s", t2 ? t2 : "(null)");
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CHECK(t2 && strstr(t2, "请规范化图片") != NULL, "应给出下一步动作");
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CHECK(t2 && strchr(t2, '\n') == NULL, "说明不该带换行");
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json_free(m2);
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/* 没有引用时不该动历史 */
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JsonValue *plain = json_new_array();
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JsonValue *pm = json_new_object();
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json_object_set_string(pm, "role", "user");
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json_object_set_string(pm, "content", "你好");
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json_array_push(plain, pm);
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CHECK(image_has_refs(plain) == 0, "纯文本历史不该报有引用");
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CHECK(image_degrade_all(plain) == 0, "纯文本历史不该被改");
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JsonValue *pw = image_expand_for_request(plain, NULL);
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CHECK(pw && json_array_size(pw) == 1, "纯文本历史应能原样复制");
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json_free(pw);
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json_free(plain);
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free(backup);
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image_set_bindir(".");
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char *cmd = xasprintf("rm -rf %s", tmpl);
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if (system(cmd) != 0) { }
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free(cmd);
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}
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static void test_pending(void)
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{
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puts("待发附件：取走即清空");
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image_pending_take(); /* 先清干净 */
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image_pending_add("1700000000_aaaa.png");
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image_pending_add("1700000001_bbbb.png");
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JsonValue *arr = image_pending_take();
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CHECK(arr && json_array_size(arr) == 2, "应取到 2 个块");
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if (arr && json_array_size(arr) == 2) {
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JsonValue *p0 = json_array_get(arr, 0);
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CHECK(strcmp(json_get_string(p0, "type"), "ligent_image") == 0,
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"类型应是内部引用块，不是协议块");
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CHECK(strcmp(json_get_string(p0, "backup"), "1700000000_aaaa.png") == 0,
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"第一个备份名");
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CHECK(json_get_string(p0, "file_id") == NULL,
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"不该再有 file_id 这种协议字段");
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CHECK(strcmp(json_get_string(json_array_get(arr, 1), "backup"),
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"1700000001_bbbb.png") == 0, "第二个备份名");
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}
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json_free(arr);
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CHECK(image_pending_take() == NULL, "取走之后应该空了");
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image_pending_add(NULL);
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image_pending_add("");
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CHECK(image_pending_take() == NULL, "空备份名不该被记下");
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}
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int main(void)
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{
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test_sniff();
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test_backup();
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test_base64();
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test_expand();
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test_pending();
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printf("\n%d 项检查，%d 项失败\n", checks, failures);
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return failures ? 1 : 0;
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}
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