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main.go
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main.go
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package main
import (
"encoding/csv"
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"path"
"path/filepath"
"strings"
)
func main() {
host := flag.String("host", "", "host domain")
file := flag.String("file", "", "data file")
resourceType := flag.String("type", "", "resource type name")
outputPath := flag.String("out", "", "output directory")
idKeys := flag.String("id", "id", "ID column names (seperate by \",\")")
perPage := flag.Int("perPage", 10, "items per page")
flag.Parse()
if *host == "" {
log.Fatal("host is required")
}
if *file == "" {
log.Fatal("file is required")
}
if *outputPath == "" {
log.Fatal("output path is required")
}
filename := path.Base(*file)
if *resourceType == "" {
inferType := filename[0 : len(filename)-len(filepath.Ext(filename))]
resourceType = &inferType
}
idKeysSlice := strings.Split(*idKeys, ",")
f, err := os.Open(*file)
if err != nil {
log.Fatal(err)
}
r := csv.NewReader(f)
// read header
header, err := r.Read()
if err != nil {
log.Fatal(err)
}
// read rows
rows, err := r.ReadAll()
if err != nil {
log.Fatal(err)
}
if err = os.RemoveAll(*outputPath); err != nil {
log.Fatal(err)
}
if err = os.MkdirAll(*outputPath, os.ModePerm); err != nil {
log.Fatal(err)
}
docs := buildPaginatedIndexDocuments(*host, *resourceType, header, rows, idKeysSlice, *perPage)
for i, doc := range docs {
bytes, err := json.Marshal(doc)
if err != nil {
log.Fatal(err)
}
out := filepath.Join(*outputPath, fmt.Sprintf("%s-%d.json", *resourceType, i))
err = ioutil.WriteFile(out, bytes, 0664)
if err != nil {
log.Fatal(err)
}
}
objDocs := buildObjectDocuments(*resourceType, header, rows, idKeysSlice)
for _, doc := range objDocs {
bytes, err := json.Marshal(doc)
if err != nil {
log.Fatal(err)
}
outDir := filepath.Join(*outputPath, *resourceType)
os.MkdirAll(outDir, os.ModePerm)
out := filepath.Join(outDir, fmt.Sprintf("%s.json", doc.Data[0].ID))
err = ioutil.WriteFile(out, bytes, 0664)
if err != nil {
log.Fatal(err)
}
}
// build rewrites
rewrites := fmt.Sprintf("/%s.json page=:p /%s-:p.json 200!\n", *resourceType, *resourceType)
rewrites += fmt.Sprintf("/%s.json /%s-0.json 200!\n", *resourceType, *resourceType)
ioutil.WriteFile(filepath.Join(*outputPath, "_redirects"), []byte(rewrites), 0664)
// build _headers
headers := fmt.Sprintf("/*")
headers += fmt.Sprintf(" Access-Control-Allow-Origin: *")
headers += fmt.Sprintf(" content-type: application/json; charset=utf-8")
ioutil.WriteFile(filepath.Join(*outputPath, "_headers"), []byte(headers), 0664)
}
type Document struct {
Meta map[string]interface{} `json:"meta,omitempty"`
Links map[string]string `json:"links,omitempty"`
Data []Object `json:"data"`
}
type Object struct {
Type string `json:"type"`
ID string `json:"id"`
Attributes map[string]interface{} `json:"attributes"`
}
func buildPaginatedIndexDocuments(host string, objType string, header []string, rows [][]string, idKeys []string, pageSize int) []Document {
var docs []Document
var objs []Object
for _, row := range rows {
obj := buildObject(objType, header, row, idKeys)
objs = append(objs, obj)
if (len(objs)) == pageSize {
doc := Document{}
doc.Data = objs
docs = append(docs, doc)
objs = make([]Object, 0)
}
}
if len(objs) > 0 {
doc := Document{}
doc.Data = objs
docs = append(docs, doc)
objs = make([]Object, 0)
}
// set meta
for i := range docs {
docs[i].Meta = map[string]interface{}{
"total-pages": len(docs),
}
}
// set links
for i := range docs {
links := make(map[string]string)
if i > 0 {
links["prev"] = fmt.Sprintf("%s/%s.json?page=%d", host, objType, i-1)
}
if i < len(docs)-1 {
links["next"] = fmt.Sprintf("%s/%s.json?page=%d", host, objType, i+1)
}
links["first"] = fmt.Sprintf("%s/%s.json?page=0", host, objType)
links["last"] = fmt.Sprintf("%s/%s.json?page=%d", host, objType, len(docs)-1)
docs[i].Links = links
}
return docs
}
func buildObjectDocuments(objType string, header []string, rows [][]string, idKeys []string) []Document {
var docs []Document
for _, row := range rows {
obj := buildObject(objType, header, row, idKeys)
doc := Document{Data: []Object{obj}}
docs = append(docs, doc)
}
return docs
}
func buildObject(objType string, header []string, row []string, idKeys []string) Object {
obj := Object{Type: objType}
kv := row2map(header, row)
id := make([]string, 0)
for _, key := range idKeys {
id = append(id, kv[key].(string))
}
obj.ID = strings.Join(id, "-")
obj.Attributes = kv
return obj
}
// row2map normalize each columns name and build a map for the row
func row2map(header []string, row []string) map[string]interface{} {
r := make(map[string]interface{})
for i, h := range header {
if looksLikeJSONObject(row[i]) || looksLikeJSONArray(row[i]) {
var m interface{}
err := json.Unmarshal([]byte(row[i]), &m)
if err != nil {
log.Fatal(err)
}
r[strings.ToLower(h)] = m
} else {
r[strings.ToLower(h)] = row[i]
}
}
return r
}
func looksLikeJSONObject(str string) bool {
return strings.HasPrefix(str, "{") && strings.HasSuffix(str, "}")
}
func looksLikeJSONArray(str string) bool {
return strings.HasPrefix(str, "[") && strings.HasSuffix(str, "]")
}