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package storage
import (
"bytes"
"context"
"fmt"
"io"
"strconv"
"strings"
"time"
"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"
"github.com/SayaAndy/saya-today-article-metadata-add/config"
"github.com/SayaAndy/saya-today-article-metadata-add/internal/frontmatter"
)
var _ StorageClient = &S3StorageClient{}
type S3StorageClient struct {
prefix string
bucket string
client *s3.Client
draftModeCfg *config.DraftModeConfig
}
func NewS3StorageClient(cfg *config.StorageConfig, draftModeCfg *config.DraftModeConfig) (StorageClient, error) {
if cfg.Type != "s3" {
return nil, fmt.Errorf("invalid storage type for S3StorageClient")
}
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
})
client := s3.NewFromConfig(awsCfg, s3Opts...)
draftModeCfgCopy := *draftModeCfg
return &S3StorageClient{
client: client,
bucket: s3cfg.BucketName,
prefix: s3cfg.Prefix,
draftModeCfg: &draftModeCfgCopy,
}, nil
}
func (sc *S3StorageClient) Scan() ([]string, error) {
var filePaths []string
paginator := s3.NewListObjectsV2Paginator(sc.client, &s3.ListObjectsV2Input{
Bucket: aws.String(sc.bucket),
Prefix: aws.String(sc.prefix),
})
for paginator.HasMorePages() {
page, err := paginator.NextPage(context.Background())
if err != nil {
return nil, fmt.Errorf("list S3 objects: %w", err)
}
for _, obj := range page.Contents {
name := aws.ToString(obj.Key)
if !strings.HasSuffix(name, ".md") {
continue
}
if sc.draftModeCfg.Enabled && !strings.HasSuffix(name, sc.draftModeCfg.DraftSuffix) {
continue
}
filePaths = append(filePaths, strings.TrimPrefix(name, sc.prefix))
}
}
return filePaths, nil
}
func (sc *S3StorageClient) GetReader(path string) (io.ReadCloser, int64, error) {
key := sc.prefix + path
out, err := sc.client.GetObject(context.Background(), &s3.GetObjectInput{
Bucket: aws.String(sc.bucket),
Key: aws.String(key),
})
if err != nil {
return nil, 0, fmt.Errorf("get S3 object %q: %w", key, err)
}
return out.Body, aws.ToInt64(out.ContentLength), nil
}
func (sc *S3StorageClient) WriteMetadata(path string, metadata *frontmatter.Metadata) error {
draftKey := sc.prefix + path
getOut, err := sc.client.GetObject(context.Background(), &s3.GetObjectInput{
Bucket: aws.String(sc.bucket),
Key: aws.String(draftKey),
})
if err != nil {
return fmt.Errorf("get draft object %q: %w", draftKey, err)
}
content, err := io.ReadAll(getOut.Body)
getOut.Body.Close()
if err != nil {
return fmt.Errorf("read draft object %q: %w", draftKey, err)
}
headOut, err := sc.client.HeadObject(context.Background(), &s3.HeadObjectInput{
Bucket: aws.String(sc.bucket),
Key: aws.String(draftKey),
})
if err != nil {
return fmt.Errorf("head draft object %q: %w", draftKey, err)
}
draftETag := aws.ToString(headOut.ETag)
geolocationParts := strings.Split(metadata.Geolocation, " ")
if (len(geolocationParts) == 1 && geolocationParts[0] != "") || len(geolocationParts) >= 4 {
return fmt.Errorf("invalid geolocation format, expecting '{x} {y} [areaError]' or an empty string")
}
if len(geolocationParts) >= 2 {
if _, err := strconv.ParseFloat(geolocationParts[0], 64); err != nil {
return fmt.Errorf("invalid geolocation parameter, expected float for X: %w", err)
}
if _, err := strconv.ParseFloat(geolocationParts[1], 64); err != nil {
return fmt.Errorf("invalid geolocation parameter, expected float for Y: %w", err)
}
}
if len(geolocationParts) == 3 {
if _, err := strconv.ParseFloat(geolocationParts[2], 64); err != nil {
return fmt.Errorf("invalid geolocation parameter, expected float for area error: %w", err)
}
}
medley := ""
if metadata.Medley != "" {
medley = fmt.Sprintf("%s %d", metadata.Medley, metadata.MedleyPart)
}
s3Metadata := map[string]string{
"title": metadata.Title,
"short-description": metadata.ShortDescription,
"action-date": metadata.ActionDate,
"published-time": metadata.PublishedTime.Format(time.RFC3339),
"thumbnail": metadata.Thumbnail,
"tags": strings.Join(metadata.Tags, ","),
"geolocation": metadata.Geolocation,
"medley": medley,
"metadata-last-update-etag": draftETag,
}
targetKey := draftKey
if sc.draftModeCfg.Enabled {
prodPath := strings.TrimSuffix(path, sc.draftModeCfg.DraftSuffix) + sc.draftModeCfg.ProdSuffix
targetKey = sc.prefix + prodPath
}
_, err = sc.client.PutObject(context.Background(), &s3.PutObjectInput{
Bucket: aws.String(sc.bucket),
Key: aws.String(targetKey),
Body: bytes.NewReader(content),
ContentType: aws.String("text/markdown; charset=utf-8"),
Metadata: s3Metadata,
})
if err != nil {
return fmt.Errorf("put S3 object %q: %w", targetKey, err)
}
return nil
}
func (sc *S3StorageClient) CompareDraftAndProd(path string) bool {
draftKey := sc.prefix + path
prodPath := strings.TrimSuffix(path, sc.draftModeCfg.DraftSuffix) + sc.draftModeCfg.ProdSuffix
prodKey := sc.prefix + prodPath
draftHead, err := sc.client.HeadObject(context.Background(), &s3.HeadObjectInput{
Bucket: aws.String(sc.bucket),
Key: aws.String(draftKey),
})
if err != nil {
return false
}
prodHead, err := sc.client.HeadObject(context.Background(), &s3.HeadObjectInput{
Bucket: aws.String(sc.bucket),
Key: aws.String(prodKey),
})
if err != nil {
return true
}
lastUpdateETag, ok := prodHead.Metadata["metadata-last-update-etag"]
if !ok {
return true
}
return aws.ToString(draftHead.ETag) != lastUpdateETag
}
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