117 lines
4.1 KiB
PHP
117 lines
4.1 KiB
PHP
<?php
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declare(strict_types=1);
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namespace App\Blog\Services;
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use App\Models\Post;
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use Illuminate\Support\Facades\Http;
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use Illuminate\Support\Str;
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/**
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* AI 封面生成：复用「AI 设置」的 LLM 配置调 OpenAI 兼容 /image_generation 接口
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* （如 MiniMax image-01），图片存入 media cover 集合（singleFile，重复生成自动替换）。
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*/
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class CoverGenerator
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{
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public function __construct(private LlmClient $llm) {}
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public function isConfigured(): bool
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{
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return $this->llm->isConfigured();
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}
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public function model(?string $override = null): string
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{
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return $override ?: (string) blog_setting('llm_image_model', 'image-01');
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}
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public function generateFor(Post $post, ?string $model = null, ?string $style = null): void
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{
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if (! $this->llm->isConfigured()) {
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throw new \RuntimeException('LLM 未配置：请先在后台「AI 设置」配置 Base URL / API Key');
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}
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// 站点无常驻 queue worker：同步产出 card 转换，避免缩略图永远卡在队列里。
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config(['media-library.queue_conversions_by_default' => false]);
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$response = $this->requestImage($this->buildPrompt($post, $style), $model);
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// 标题触发内容审核（input new_sensitive）：退化为不含标题的通用提示词重试一次。
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if (str_contains((string) $response->body(), 'sensitive')
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&& ! is_string($response->json('data.image_urls.0'))) {
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$response = $this->requestImage($this->neutralPrompt($style), $model);
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}
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if ($response->failed()) {
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throw new \RuntimeException('HTTP '.$response->status().'：'.Str::limit($response->body(), 200));
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}
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$url = $response->json('data.image_urls.0');
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if (! is_string($url) || $url === '') {
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$reason = $response->json('base_resp.status_msg') ?: $response->body();
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throw new \RuntimeException('接口未返回图片：'.Str::limit((string) $reason, 200));
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}
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$image = Http::timeout(60)->get($url)->throw();
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$ext = match (strtolower(explode(';', (string) $image->header('Content-Type'))[0])) {
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'image/png' => 'png',
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'image/webp' => 'webp',
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default => 'jpg',
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};
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$tmp = tempnam(sys_get_temp_dir(), 'cover_');
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file_put_contents($tmp, $image->body());
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try {
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$post->addMedia($tmp)
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->usingFileName('cover-'.$post->id.'.'.$ext)
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->toMediaCollection('cover');
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} finally {
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@unlink($tmp);
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}
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}
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public function buildPrompt(Post $post, ?string $style = null): string
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{
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$style = trim((string) ($style
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?: blog_setting('cover_prompt_style', '扁平插画风格，色调柔和，构图简洁')));
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$excerpt = Str::limit(trim(strip_tags((string) $post->excerpt)), 60, '');
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$parts = ["为博客文章《{$post->title}》生成一张封面配图"];
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if ($excerpt !== '') {
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$parts[] = "内容大意：{$excerpt}";
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}
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$parts[] = $style;
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$parts[] = '画面中不要出现任何文字';
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return implode('。', $parts);
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}
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/**
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* 不含标题/摘要的通用封面提示词（标题触发审核时的兜底）。
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*/
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public function neutralPrompt(?string $style = null): string
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{
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$style = trim((string) ($style
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?: blog_setting('cover_prompt_style', '扁平插画风格，色调柔和，构图简洁')));
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return "博客文章封面配图。{$style}。画面中不要出现任何文字";
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}
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private function requestImage(string $prompt, ?string $model = null): \Illuminate\Http\Client\Response
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{
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return Http::timeout(120)
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->withToken($this->llm->apiKey())
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->post($this->llm->baseUrl().'/image_generation', [
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'model' => $this->model($model),
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'prompt' => $prompt,
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'aspect_ratio' => '16:9',
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'response_format' => 'url',
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'n' => 1,
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'prompt_optimizer' => true,
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]);
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}
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}
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