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// Package lulu is a client library for the Lulu book printing API.
package lulu
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"golang.org/x/oauth2/clientcredentials"
)
const (
SandboxUrl = "https://api.sandbox.lulu.com/"
ProductionUrl = "https://api.lulu.com/"
tokenPath = "/auth/realms/glasstree/protocol/openid-connect/token"
validateInteriorPath = "/validate-interior"
coverDimensionsPath = "/cover-dimensions"
validateCoverPath = "/validate-cover"
)
// ApiUrl is the location of the API server. It is set to the sandbox
// environment by default; change it to the production environment when
// you are ready to deploy.
var ApiUrl = SandboxUrl
// Unit is a unit of length measurement.
type Unit string
const (
Points Unit = "pt"
Millimeters = "mm"
Inches = "inch"
)
type ValidationStatus string
const (
StatusNull ValidationStatus = "NULL" // file validation is not started yet
StatusValidating ValidationStatus = "VALIDATING" // file validation is still running
StatusValidated ValidationStatus = "VALIDATED" // file validation finished without any errors
StatusNormalizing ValidationStatus = "NORMALIZING" // file normalization (next step of validation, available only if pod_package_id is was passed in the payload) is still running
StatusNormalized ValidationStatus = "NORMALIZED" // file normalization finished without any errors
StatusError ValidationStatus = "ERROR" // file is invalid, list of errors is included in the response
)
func (s ValidationStatus) IsFinal() bool {
switch s {
case StatusValidated, StatusNormalized, StatusError:
return true
}
return false
}
// validateInteriorReq is the json body of a /validate-interior/ request.
type validateInteriorReq struct {
SrcUrl string `json:"source_url"`
PkgId PkgId `json:"pod_package_id"`
}
// validateInteriorReq is the json body of a /validate-interior/ request without the optional pod_package_id.
type validateInteriorBasicReq struct {
SrcUrl string `json:"source_url"`
}
// InteriorValidationRecord contains the validation status of an interior file.
type InteriorValidationRecord struct {
Id uint
SrcUrl string `json:"source_url"`
NPages uint `json:"page_count"`
Errors string
Status ValidationStatus
ValidPkgIds []PkgId `json:"valid_pod_package_ids"`
}
type Client struct {
c *http.Client
}
// NewClient returns a client that will use the given client-key and
// client-secret to connect to the API server.
func NewClient(ctx context.Context, key, secret string) (*Client, error) {
tokenUrl, err := url.JoinPath(ApiUrl, tokenPath)
if err != nil {
return nil, err
}
cfg := &clientcredentials.Config{
ClientID: key,
ClientSecret: secret,
TokenURL: tokenUrl,
}
return &Client{cfg.Client(ctx)}, nil
}
// ValidateInterior starts a server-side validation job for the interior
// file located at srcUrl using manufacturing settings given by mfg. It
// returns the ID of the job. Use GetInteriorValidation() to poll the
// status of the job.
//
// https://api.lulu.com/docs/#tag/Files-validation/operation/Validate-Interior_create
func (c *Client) ValidateInterior(srcUrl string, mfg PkgId) (uint, error) {
return c.validateInterior(validateInteriorReq{srcUrl, mfg})
}
// ValidateInteriorBasic is like ValidateInterior but without the
// optional pod_package_id.
//
// https://api.lulu.com/docs/#tag/Files-validation/operation/Validate-Interior_create
func (c *Client) ValidateInteriorBasic(srcUrl string) (uint, error) {
return c.validateInterior(validateInteriorBasicReq{srcUrl})
}
func (c *Client) validateInterior(payload any) (uint, error) {
body, err := json.Marshal(payload)
if err != nil {
return 0, fmt.Errorf("lulu: error encoding request body %v for %s: %w", payload, validateInteriorPath, err)
}
url, err := url.JoinPath(ApiUrl, validateInteriorPath)
if err != nil {
return 0, fmt.Errorf("lulu: %w", err)
}
resp, err := c.c.Post(url, "application/json", bytes.NewBuffer(body))
if err != nil {
return 0, fmt.Errorf("lulu: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusCreated {
body, _ := io.ReadAll(resp.Body)
return 0, fmt.Errorf("lulu: POST %s: %s: %s", url, resp.Status, body)
}
buf := new(bytes.Buffer)
if _, err := io.Copy(buf, resp.Body); err != nil {
return 0, fmt.Errorf("lulu: POST %s: error reading response body: %w", url, err)
}
dec := json.NewDecoder(buf)
var rec InteriorValidationRecord
if err := dec.Decode(&rec); err != nil {
return 0, fmt.Errorf("lulu: POST %s: error decoding response body %q: %w", url, buf, err)
}
return rec.Id, nil
}
// GetInteriorValidation retrieves information about an interior file
// validation job that was started by ValidateInterior().
//
// https://api.lulu.com/docs/#tag/Files-validation/operation/Validate-Interior_read
func (c *Client) GetInteriorValidation(id uint) (InteriorValidationRecord, error) {
url, err := url.JoinPath(ApiUrl, validateInteriorPath, fmt.Sprint(id))
if err != nil {
return InteriorValidationRecord{}, fmt.Errorf("lulu: %w", err)
}
resp, err := c.c.Get(url)
if err != nil {
return InteriorValidationRecord{}, fmt.Errorf("lulu: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
body, _ := io.ReadAll(resp.Body)
return InteriorValidationRecord{}, fmt.Errorf("lulu: GET %s: %s: %s", url, resp.Status, body)
}
buf := new(bytes.Buffer)
if _, err := io.Copy(buf, resp.Body); err != nil {
return InteriorValidationRecord{}, fmt.Errorf("lulu: GET %s: error reading response body: %w", url, err)
}
dec := json.NewDecoder(buf)
var rec InteriorValidationRecord
if err := dec.Decode(&rec); err != nil {
return rec, fmt.Errorf("lulu: GET %s: error decoding response body %q: %w", url, buf, err)
}
return rec, nil
}
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