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using System ;
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using System.ComponentModel ;
using System.Threading.Tasks ;
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using Serilog ;
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using ShareeBike.Model ;
using ShareeBike.Model.Device ;
using ShareeBike.Model.Services.CopriApi ;
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using Xamarin.Essentials ;
using Xamarin.Forms ;
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using ShareeBike.Model.Connector ;
using ShareeBike.ViewModel.Contact ;
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namespace ShareeBike.ViewModel.LegalInformation
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{
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/// <summary> Manges the tabbed info page. </summary>
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public class LegalInformationPageViewModel : INotifyPropertyChanged
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{
/// <summary> Fired whenever a property changed.</summary>
public event PropertyChangedEventHandler PropertyChanged ;
/// <summary> Holds the name of the host.</summary>
private string HostName { get ; }
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/// <summary> Holds value whether site caching is on or off.</summary>
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bool IsSiteCachingOn { get ; }
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/// <summary>
/// Relative path to agb resources of empty if value was not yet querried from backend.
/// </summary>
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private string GtcResourcePath { get ; set ; }
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/// <summary>
/// Relative path to privacy resources of empty if value was not yet querried from backend.
/// </summary>
private string PrivacyResourcePath { get ; set ; }
/// <summary>
/// Relative path to impress resources of empty if value was not yet querried from backend.
/// </summary>
private string ImpressResourcePath { get ; set ; }
private bool _IsIdle = false ;
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/// <summary>
/// Is true if no action is pending, false otherwise.
/// </summary>
public bool IsIdle
{
get = > _IsIdle ;
private set
{
if ( _IsIdle = = value )
{
// Nothing to do.
return ;
}
_IsIdle = value ;
PropertyChanged ? . Invoke ( this , new PropertyChangedEventArgs ( nameof ( IsIdle ) ) ) ;
return ;
}
}
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/// <summary>
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/// Object to query resources urls object from backend if required.
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/// This object is used to update resources path values <see cref="GtcResourcePath"/>, <see cref="PrivacyResourcePath"/> and <see cref="ImpressResourcePath"/> from.
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/// </summary>
private Func < IQuery > QueryProvider { get ; }
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/// <summary>
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/// Action to update shared resources urls object exposed by main model.
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/// </summary>
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private Action < IResourceUrls > UpdateUrlsAction { get ; }
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/// <summary> Constructs Info view model</summary>
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/// <param name="hostName">Name of the host to get html resources from.</param>
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/// <param name="isSiteCachingOn">Holds value whether site caching is on or off.</param>
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/// <param name="gtcResourcePath"> Agb resource path received from backend.</param>
/// <param name="privacyResourcePath"> PrivacyHtml resource path received from backend.</param>
/// <param name="impressResourcePath"> ImpressHtml resource path received from backend.</param>
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/// <param name="resourceProvider">Delegate to get embedded html resource. Used as fallback if download from web page does not work and cache is empty.</param>
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/// <param name="queryProvider">Object to query resources urls object from backend if required.</param>
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/// <param name="updateUrlsAction">Action to update shared resources urls object</param>
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public LegalInformationPageViewModel (
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string hostName ,
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string gtcResourcePath ,
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string privacyResourcePath ,
string impressResourcePath ,
bool isSiteCachingOn ,
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Func < string , string > resourceProvider ,
Func < IQuery > queryProvider ,
Action < IResourceUrls > updateUrlsAction )
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{
HostName = hostName ;
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GtcResourcePath = gtcResourcePath ;
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PrivacyResourcePath = privacyResourcePath ;
ImpressResourcePath = impressResourcePath ;
IsSiteCachingOn = isSiteCachingOn ;
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QueryProvider = queryProvider ;
UpdateUrlsAction = updateUrlsAction ;
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GtcHtml = new HtmlWebViewSource { Html = "<html>Loading...</html>" } ;
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ResourceProvider = resourceProvider
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? ? throw new ArgumentException ( $"Can not instantiate {typeof(LegalInformationPageViewModel)}-object. No resource provider centered." ) ;
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}
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// Get resource urls object from backend.
public async Task < IResourceUrls > GetUrls ( )
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{
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Result < StationsAndBikesContainer > stations ;
try
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{
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stations = await QueryProvider ( ) . GetBikesAndStationsAsync ( ) ;
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}
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catch ( Exception ex )
{
Log . ForContext < LegalInformationPageViewModel > ( ) . Error ( $"Getting resource urls from COPRI failed. {ex.Message}" ) ;
return new ResourceUrls ( ) ;
}
return stations ? . GeneralData ? . ResourceUrls ? ? new ResourceUrls ( ) ;
}
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/// <summary> Called when page is shown. </summary>
public async void OnAppearing ( )
{
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// Set state to busy.
IsIdle = false ;
// Check if urls to show info from are already known.
if ( string . IsNullOrEmpty ( PrivacyResourcePath ) )
{
var urls = await GetUrls ( ) ;
PrivacyResourcePath = urls . PrivacyResourcePath ;
ImpressResourcePath = urls . ImpressResourcePath ;
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GtcResourcePath = urls . GtcResourcePath ;
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UpdateUrlsAction ( urls ) ; // Update main model to prevent duplicate queries.
}
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//set font size for html content (necessary for iOS)
string headerString = "<header><meta name='viewport' content='width=device-width, intial-scale=2.0, maximum-scale=5.0, minimum-scale=1.0, user-scalable=no'></header>" ;
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// Gets privacy info from server.
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async Task < HtmlWebViewSource > GetPrivacy ( )
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{
string GetUriText ( )
= > $"https://{HostName}/{PrivacyResourcePath}" ;
if ( string . IsNullOrEmpty ( PrivacyResourcePath ) )
{
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// Information to access resource is missing
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return new HtmlWebViewSource
{
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Html = headerString + await Task . FromResult ( ViewModelHelper . FromBody ( "No privacy resource available. Resource path is null or empty." ) )
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} ;
}
Log . Debug ( $"Request to open url {GetUriText()} to get privacy info." ) ;
return new HtmlWebViewSource
{
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Html = headerString + await ViewModelHelper . GetSource (
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GetUriText ( ) , // "site/privacy.html"
IsSiteCachingOn )
} ;
}
// Gets impress info from server.
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async Task < HtmlWebViewSource > GetImpress ( )
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{
string GetUriText ( )
= > $"https://{HostName}/{ImpressResourcePath}" ;
if ( string . IsNullOrEmpty ( ImpressResourcePath ) )
{
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// Information to access resource is missing
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return new HtmlWebViewSource
{
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Html = headerString + await Task . FromResult ( ViewModelHelper . FromBody ( "No impress resource available. Resource path is null or empty." ) )
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} ;
}
Log . Debug ( $"Request to open url {GetUriText()} to get impress info." ) ;
return new HtmlWebViewSource
{
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Html = headerString + await ViewModelHelper . GetSource (
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GetUriText ( ) , // "site/privacy.html"
IsSiteCachingOn )
} ;
}
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GtcHtml = await GetGtc ( HostName , GtcResourcePath , IsSiteCachingOn ) ;
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PrivacyHtml = await GetPrivacy ( ) ;
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ImpressHtml = await GetImpress ( ) ;
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// Set state to idle.
IsIdle = true ;
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}
/// <summary> Gets the AGBs</summary>
/// <param name="resourceProvider"></param>
/// <returns> AGBs</returns>
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public static async Task < HtmlWebViewSource > GetGtc (
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string hostName ,
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string gtcResourcePath ,
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bool isSiteCachingOn )
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{
string GetUriText ( )
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= > $"https://{hostName}/{gtcResourcePath}" ;
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//set font size for html content (necessary for iOS)
string headerString = "<header><meta name='viewport' content='width=device-width, intial-scale=2.0, maximum-scale=5.0, minimum-scale=1.0, user-scalable=no'></header>" ;
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if ( string . IsNullOrEmpty ( gtcResourcePath ) )
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{
return new HtmlWebViewSource
{
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Html = headerString + await Task . FromResult ( ViewModelHelper . FromBody ( "No terms resource available. Resource path is null or empty." ) )
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} ;
}
Log . Debug ( $"Request to open url {GetUriText()} to get AGB infos." ) ;
return new HtmlWebViewSource
{
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Html = headerString + await ViewModelHelper . GetSource (
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GetUriText ( ) , // "agb.html"
isSiteCachingOn )
} ;
}
/// <summary> Gets the platfrom specific prefix. </summary>
private Func < string , string > ResourceProvider { get ; set ; }
/// <summary> Gets the app related information (app version and licenses). </summary>
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public HtmlWebViewSource AppHtml = > new HtmlWebViewSource
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{
Html = ResourceProvider ( "HtmlResouces.V02.InfoLicenses.html" )
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. Replace ( "CURRENT_VERSION_ShareeBikeAPP" , DependencyService . Get < IAppInfo > ( ) . Version . ToString ( ) )
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. Replace ( "ACTIVE_APPNAME" , AppInfo . Name )
. Replace ( "APPSUPPORTMAILADDRESS" , ContactPageViewModel . APPSUPPORTMAILADDRESS )
} ;
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/// <summary> PrivacyHtml text.</summary>
private HtmlWebViewSource impressHtml ;
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/// <summary> Gets the privacy related information. </summary>
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public HtmlWebViewSource ImpressHtml
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{
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get = > impressHtml ;
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set
{
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impressHtml = value ;
PropertyChanged ? . Invoke ( this , new PropertyChangedEventArgs ( nameof ( ImpressHtml ) ) ) ;
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}
}
/// <summary> Agb information text.</summary>
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private HtmlWebViewSource gtcHtml ;
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/// <summary> PrivacyHtml text.</summary>
private HtmlWebViewSource privacyHtml ;
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/// <summary> Agb information text.</summary>
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public HtmlWebViewSource GtcHtml
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{
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get = > gtcHtml ;
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set
{
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gtcHtml = value ;
PropertyChanged ? . Invoke ( this , new PropertyChangedEventArgs ( nameof ( GtcHtml ) ) ) ;
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}
}
/// <summary> Agb information text.</summary>
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public HtmlWebViewSource PrivacyHtml
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{
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get = > privacyHtml ;
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set
{
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privacyHtml = value ;
PropertyChanged ? . Invoke ( this , new PropertyChangedEventArgs ( nameof ( PrivacyHtml ) ) ) ;
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}
}
}
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}