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package blog
import (
"context"
"fmt"
"io"
"slices"
"strings"
"time"
"github.com/SayaAndy/saya-today-web/config"
"github.com/SayaAndy/saya-today-web/internal/frontmatter"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/credentials"
"github.com/aws/aws-sdk-go-v2/service/s3"
)
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)
s3cl := s3.New(s3.Options{
Region: s3cfg.Region,
BaseEndpoint: aws.String(s3cfg.Endpoint),
Credentials: credentials.NewStaticCredentialsProvider(s3cfg.AccessKeyID, s3cfg.SecretAccessKey, ""),
})
return &S3Client{s3cfg.Prefix, s3cfg.BucketName, s3cl}, nil
}
func (c *S3Client) Scan(prefix string) ([]*Page, error) {
pages := []*Page{}
fullPrefix := c.prefix + prefix
input := &s3.ListObjectsV2Input{
Bucket: aws.String(c.bucketName),
Prefix: aws.String(fullPrefix),
}
paginator := s3.NewListObjectsV2Paginator(c.s3cl, input)
for paginator.HasMorePages() {
output, err := paginator.NextPage(context.Background())
if err != nil {
return nil, fmt.Errorf("list S3 objects: %w", err)
}
for _, obj := range output.Contents {
key := aws.ToString(obj.Key)
if !strings.HasSuffix(key, ".md") {
continue
}
head, err := c.s3cl.HeadObject(context.Background(), &s3.HeadObjectInput{
Bucket: aws.String(c.bucketName),
Key: aws.String(key),
})
if err != nil {
return nil, fmt.Errorf("head S3 object %s: %w", key, err)
}
if head.ContentType == nil || !strings.Contains(*head.ContentType, "text/markdown") {
continue
}
meta := head.Metadata
if meta["title"] == "" {
continue
}
publishedTime, err := time.Parse(time.RFC3339, meta["published-time"])
if err != nil {
return nil, fmt.Errorf("failed to parse published time metadata field: %w", err)
}
linkParts := strings.Split(key, "/")
nameParts := strings.Split(linkParts[len(linkParts)-1], ".")
fileName := strings.Join(nameParts[:len(nameParts)-1], ".")
tags := strings.Split(meta["tags"], ",")
slices.Sort(tags)
lang, _ := strings.CutPrefix(linkParts[0], c.prefix)
pages = append(pages, &Page{
Link: key,
FileName: fileName,
Lang: lang,
ModifiedTime: aws.ToTime(obj.LastModified),
Metadata: &frontmatter.Metadata{
Title: meta["title"],
ShortDescription: meta["short-description"],
ActionDate: meta["action-date"],
PublishedTime: publishedTime,
Thumbnail: meta["thumbnail"],
Tags: tags,
Geolocation: meta["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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