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package blog
import (
"context"
"encoding/json"
"fmt"
"io"
"strings"
"github.com/SayaAndy/saya-today-web/config"
"github.com/SayaAndy/saya-today-web/internal/frontmatter"
"github.com/aws/aws-sdk-go-v2/aws"
awsconfig "github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/credentials"
"github.com/aws/aws-sdk-go-v2/service/s3"
)
const s3ScanConcurrency = 32
type S3Client struct {
prefix string
bucketName string
s3cl *s3.Client
}
func NewS3Client(cfg *config.StorageConfig) (Client, error) {
if cfg.Type != "s3" {
return nil, fmt.Errorf("invalid storage type for S3Client")
}
s3cfg := cfg.Config.(*config.S3Config)
opts := []func(*awsconfig.LoadOptions) error{
awsconfig.WithRegion(s3cfg.Region),
}
if s3cfg.AccessKeyID != "" && s3cfg.SecretAccessKey != "" {
opts = append(opts, awsconfig.WithCredentialsProvider(
credentials.NewStaticCredentialsProvider(s3cfg.AccessKeyID, s3cfg.SecretAccessKey, ""),
))
}
awsCfg, err := awsconfig.LoadDefaultConfig(context.Background(), opts...)
if err != nil {
return nil, fmt.Errorf("load AWS config: %w", err)
}
var s3Opts []func(*s3.Options)
if s3cfg.Endpoint != "" {
s3Opts = append(s3Opts, func(o *s3.Options) {
o.BaseEndpoint = aws.String(s3cfg.Endpoint)
})
}
s3Opts = append(s3Opts, func(o *s3.Options) {
o.UsePathStyle = s3cfg.UsePathStyle
o.DisableLogOutputChecksumValidationSkipped = true
})
s3cl := s3.NewFromConfig(awsCfg, s3Opts...)
return &S3Client{s3cfg.Prefix, s3cfg.BucketName, s3cl}, nil
}
func (c *S3Client) Scan(prefix string) ([]*Page, error) {
out, err := c.s3cl.GetObject(context.Background(), &s3.GetObjectInput{
Bucket: aws.String(c.bucketName),
Key: aws.String(IndexFileName),
})
if err != nil {
return nil, fmt.Errorf("get %s: %w", IndexFileName, err)
}
defer out.Body.Close()
raw, err := io.ReadAll(out.Body)
if err != nil {
return nil, fmt.Errorf("read %s: %w", IndexFileName, err)
}
var idx Index
if err := json.Unmarshal(raw, &idx); err != nil {
return nil, fmt.Errorf("unmarshal %s: %w", IndexFileName, err)
}
wantLang := ""
if i := strings.Index(prefix, "/"); i > 0 {
wantLang = prefix[:i]
}
fullPrefix := c.prefix + prefix
pages := make([]*Page, 0)
for catKey, cat := range idx.Categories {
lang, ok := strings.CutPrefix(catKey, c.prefix)
if !ok {
continue
}
if wantLang != "" && wantLang != lang {
continue
}
for _, e := range cat.Pages {
if !strings.HasPrefix(e.Link, fullPrefix) {
continue
}
fileName := e.Link[strings.LastIndex(e.Link, "/")+1 : strings.LastIndex(e.Link, ".")]
pages = append(pages, &Page{
Link: e.Link,
FileName: fileName,
Lang: lang,
ModifiedTime: e.ModifiedTime,
Metadata: &frontmatter.Metadata{
Title: e.Title,
ShortDescription: e.ShortDescription,
ActionDate: e.ActionDate,
PublishedTime: e.PublishedTime,
Thumbnail: e.Thumbnail,
Tags: e.Tags,
Geolocation: e.Geolocation,
},
})
}
}
return pages, nil
}
func (c *S3Client) ReadAll(path string) ([]byte, error) {
output, err := c.s3cl.GetObject(context.Background(), &s3.GetObjectInput{
Bucket: aws.String(c.bucketName),
Key: aws.String(c.prefix + path),
})
if err != nil {
return nil, fmt.Errorf("get S3 object: %w", err)
}
defer output.Body.Close()
content, err := io.ReadAll(output.Body)
if err != nil {
return nil, fmt.Errorf("read S3 object body: %w", err)
}
return content, nil
}
func (c *S3Client) ReadFrontmatter(path string) (metadata *frontmatter.Metadata, markdown []byte, err error) {
contentBytes, err := c.ReadAll(path)
if err != nil {
return nil, nil, fmt.Errorf("failed to read file for frontmatter parsing: %w", err)
}
return frontmatter.ParseFrontmatter(contentBytes)
}
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